Open access peer-reviewed chapter - ONLINE FIRST
Submitted: 31 July 2025 Reviewed: 08 August 2025 Published: 17 February 2026
DOI: 10.5772/intechopen.1012415
From the Edited Volume
Aldemir B. Oliveira-Filho and Ricardo Roberto de Souza Fonseca
Emergency medical services (EMS) reach millions of Americans every year, yet seldom contribute to the nation’s HIV-prevention goals. This chapter argues that the mobility, public-trust capital, and round-the-clock availability of EMS can be leveraged to shorten the diagnostic window, accelerate linkage to antiretroviral therapy, and expand access to pre-exposure prophylaxis (PrEP). We synthesize epidemiological data illustrating persistent disparities in HIV incidence, outline how point-of-care fourth- and fifth-generation assays plus brief risk-screening tools can fit into a sub-30-minute low-acuity encounter, and show that existing CLIA waivers, community-paramedicine statutes, and interstate licensure compacts already permit paramedics to perform rapid testing and administer prophylactic injections. Evidence from pilot studies demonstrates high patient acceptability, favorable cost-effectiveness, and improved same-day linkage, while implementation-science frameworks (CFIR and RE-AIM) provide a roadmap for scale-up and evaluation. We examine barriers such as crew workload and data interoperability, highlight facilitators including bidirectional ePCR–EHR exchange and Medicaid reimbursement pathways, and propose a tiered evaluation plan encompassing process, outcome, and equity metrics. Future directions encompass multi-plex STI cartridges, mobile-integrated chronic-disease prevention, digital adherence tools, and adaptations for low-resource ambulance systems. Deploying HIV prevention in the pre-hospital arena transforms ambulances from mere transport vehicles into frontline public-health assets capable of advancing the ending the HIV epidemic initiative.
Human immunodeficiency virus (HIV) remains a significant public health challenge in the United States, with approximately 30,000 new diagnoses reported each year despite decades of advances in prevention and treatment [1]. Prevention strategies have evolved from behavior-change interventions and condom distribution to include biomedical approaches such as antiretroviral therapy (ART) for treatment as prevention (TasP) and daily pre-exposure prophylaxis (PrEP) [2]. The Centers for Disease Control and Prevention (CDC) estimates that, with full uptake and adherence, PrEP could avert up to 99% of sexual HIV transmissions [3]. Yet uptake remains uneven, with nearly 80% of those estimated to be at substantial risk for HIV not receiving PrEP [4]. Equally critical is routine and accessible HIV testing: timely diagnosis not only enables an immediate offer of PrEP to those testing negative and linkage to care for those testing positive, but also drives down community viral load, interrupting transmission chains [5].
Early identification of HIV infection and rapid linkage to care are foundational to both individual health outcomes and broader epidemic control [6]. Individuals who initiate ART soon after diagnosis achieve viral suppression more quickly, reducing morbidity, preserving immune function, and minimizing the risk of onward transmission [7]. Moreover, frequent testing and prompt referral facilitate secondary prevention, allowing health systems to engage partners and networks at greatest risk [8]. However, barriers such as stigma, limited clinic hours, transportation difficulties, and lack of awareness continue to impede timely testing and linkage, disproportionately affecting marginalized populations [9]. As a result, approximately 14% of people living with HIV in the USA remain undiagnosed, underscoring the need for innovative outreach approaches that meet individuals where they are [10].
Emergency medical services (EMS) constitute a critical access point for millions of patients each year. Over 240 million 911 responses are logged annually in the USA [11]. Despite this volume, EMS agencies have traditionally focused on acute stabilization and transport, with limited integration into preventive health initiatives [12]. Public health models have sporadically engaged EMS for interventions such as blood pressure screening or naloxone distribution, but systematic incorporation of HIV testing and PrEP linkage has not been widely implemented [13]. Given their unique position at the intersection of community and healthcare, EMS providers could offer point-of-care (POC) rapid HIV testing and PrEP screening in the field, thus lowering structural barriers to access and extending the reach of prevention services [14].
This review examines the potential for mobilizing pre-hospital providers in the national HIV response by integrating rapid HIV testing and PrEP screening protocols into EMS practice. We begin by summarizing the epidemiology of new HIV diagnoses in the USA and current prevention frameworks, with an emphasis on biomedical interventions. Next, we explore the evidence supporting early diagnosis and linkage to care, highlighting gaps in service delivery among high-risk and underserved populations. We then assess existing models of EMS-based preventive care and identify operational, regulatory, and training considerations specific to HIV testing and PrEP initiation. Finally, we propose a conceptual framework for implementation, detail potential barriers and facilitators, and suggest avenues for future research and policy development. By articulating a structured approach to pre-hospital HIV prevention, this review aims to catalyze interdisciplinary collaboration and inform pilot programs that leverage EMS as a scalable platform for Ending the HIV Epidemic.
The most recent supplemental surveillance report estimates 31,800 (95% CI 29,600–34,100) incident HIV infections in 2022, marking a 12% decline from 2018 and the lowest annual total recorded since nationwide reporting began [14]. At the end of 2022, approximately 1.2 million people were living with HIV (PLWH) in the USA; 87% were aware of their infection, leaving an
Geographic concentration remains pronounced. In 2023, 51% of all 39,201 new HIV diagnoses occurred in the Southern US, a region that contains only 38% of the national population [16]. Diagnosis rates continue to be highest in the District of Columbia and in southern states such as Georgia and Florida, whereas Midwestern states report the lowest rates.
Demographically, the epidemic is still driven by sexual transmission among men who have sex with men (MSM). In 2023, 66% of diagnoses were attributed to male-to-male sexual contact, and more than 80% of new diagnoses occurred in men [16]. Black/African American and Hispanic/Latino persons together accounted for 73% of diagnoses despite representing approximately 31% of the US population; among women, Black women alone contributed half of all female diagnoses and experienced an HIV diagnosis rate 11-fold higher than that of White women [16]. Age patterns also persist; adults aged 25–44 years made up roughly 60% of 2023 diagnoses, while the 13–24 cohort, although smaller in absolute terms, has the greatest proportion of undiagnosed infections [14, 16].
The federal Ending the HIV Epidemic (EHE) initiative, launched in 2019, sets two headline targets: a 75% reduction in new HIV infections by 2025 and a 90% reduction by 2030, translating to fewer than 3,000 infections annually [17]. Operationalization of this goal relies on four pillars: diagnose, treat, prevent, and respond. The goal was implemented first in 57 priority jurisdictions that accounted for more than 50% of recent diagnoses.
Progress is monitored through 13 national indicators aligned with the National HIV/acquired immunodeficiency syndrome (AIDS) Strategy. Interim 2025 goals include 95% knowledge of HIV status, 50% PrEP coverage among those with indications, 95% linkage to care within one month, and 95% viral suppression among persons with diagnosed HIV [18]. As of 2022, the country has met or exceeded annual targets for declines in incidence (–14% vs. a –19% target) and improvements in viral suppression (81% vs. an 82% target) but remains off-track for PrEP coverage (<40%) and for viral suppression among key subpopulations, such as persons who inject drugs [18]. Accelerated case finding, particularly among young, Black, and southern MSM, and scale-up of PrEP and rapid antiretroviral initiation remain critical if the 2025 milestones are to be met.
While the EHE framework remains on the books, the fiscal and administrative priorities of the current presidential administration have shifted markedly and could impede progress toward the 2025 and 2030 incidence-reduction milestones.
Taken together, the proposed funding rescissions and the research-grant turmoil threaten to widen the existing shortfalls in PrEP coverage and viral-suppression equity, undercutting the very mechanisms required to achieve EHE’s 75% incidence reduction by 2025 and 90% by 2030. Close congressional scrutiny and, if necessary, remedial appropriations will be essential to prevent a reversal of the recent gains documented in Sections 2.1–2.3.
Timely recognition of HIV infection confers two parallel advantages: it preserves the health of the newly diagnosed individual, and it short-circuits onward transmission. The START randomized trial demonstrated that initiating ART at the time of diagnosis, irrespective of CD4 count, halved the composite risk of serious AIDS and non-AIDS events and lowered all-cause mortality, establishing “immediate ART” as the therapeutic standard [22]. More recent real-world data from a 1,409-patient integrated-system cohort show that beginning ART within seven days of a positive test shaved almost a month off the time to viral suppression (median 48 vs. 77 days) and reduced cumulative viremia, the biologic currency of transmission risk [23]. US national curriculum guidance therefore defines optimal linkage as a first HIV-care visit within seven days (mandatory within 30) and urges service planners to embed linkage pathways into every testing encounter, a requirement that field-based teams can satisfy on scene through electronic referrals or telehealth “warm hand-offs” [24].
Treatment has become prevention. Long-term follow-up of the HIV prevention trials network study 052 (HPTN 052) couples study confirmed a 93% reduction in genetically linked transmission events when the positive partner started ART early, an effect that persisted for a decade [25]. Consolidating such individual benefits across whole catchment areas drives down the community viral load, a population-level metric now tracked by the World Health Organization (WHO) and national programs. In 2023, WHO reiterated that people who remain durably undetectable “do not transmit HIV,” underscoring the public-health dividend of rapid diagnosis-to-suppression pipelines [26]. Pre-hospital testing and reflex ART initiation can truncate the high-infectiousness window that characterizes acute and early infection, thereby accelerating community-level viral-load suppression and contributing to incidence targets.
Conventional clinic models presuppose that clients can travel, obtain time off work, and navigate stigma within healthcare spaces – assumptions that fail many of those most at risk. Mobile and community-paramedicine platforms invert that logic by taking services
By collapsing geographic, logistical, and psychosocial barriers, pre-hospital programs extend the reach of the “diagnose” and “linkage” pillars of the EHE initiative into settings where conventional healthcare touchpoints are scarce – an essential precondition for meeting the 2025 and 2030 incidence-reduction milestones.
US pre-hospital care rests on a tiered certification scaffold formalized in the National EMS Scope of Practice Model. This framework recognizes four clinician levels: emergency medical responder, emergency medical technician (EMT-B), advanced EMT (AEMT), and paramedic (EMT-P), and specifies the maximum skill set for each. Recent change notices (2021) expanded EMT-B authority to include intramuscular injections, intranasal naloxone, and vaccine administration during declared public-health emergencies, while confirming that paramedics may obtain POC specimens and initiate complex pharmacotherapy [31].
Community paramedicine (also styled mobile integrated health, MIH) operates beyond the 9-1-1 paradigm, allowing cross-disciplinary preventive and chronic care roles. By early 2025, 45 states had enacted statutes or pilot rules that define or reimburse community-paramedicine services, a sharp rise from just 17 jurisdictions five years earlier [32]. Interstate practice has been eased by the recognition of EMS personnel licensure interstate compact (EMS compact), now adopted by 24 member states, which grants a privilege to practice across borders without duplicate licensure [33]. At the federal level, the pending Community Paramedicine Act of 2024 (H.R. 8042) would authorize Medicare payment for preventive home visits and chronic-disease management delivered by certified paramedics, signaling congressional intent to mainstream MIH reimbursement
The 2023 National EMS Database recorded 54.2 million activations, of which 36.4 million were 9-1-1 responses that culminated in patient transport, equivalent to one treated transport every 0.9 seconds nationwide [35]. Patients aged 21–40 years accounted for 38% of these encounters, and Black/African American individuals represented 22.7% of patients, a proportion nearly double their share of the US population, underscoring EMS access to communities disproportionately affected by HIV [35].
Two call categories illustrate direct intersections with HIV-transmission risk. First, paramedics administered naloxone 475,176 times in 2023 (3.8% of all medication events), a visible marker of injection-drug use and an entry point for harm-reduction counseling [35]. NEMSIS surveillance further logged approximately 650,000 suspected non-fatal overdose events in 2023, confirming the scale of opioid-related encounters [36]. Second, EMS documented 1.41 million assault-related injuries, 28% of the injury caseload; such scenes routinely involve sexual violence or exchange-sex economies where acute HIV testing is critical [35]. Collectively, these data show that front-line crews meet large volumes of patients with substance-use, violence, or socioeconomic vulnerabilities that align with federal HIV-priority demographics.
EMS systems have already tested and normalized public health functions that parallel rapid HIV testing and PrEP triage:
These precedents confirm that when protocols, training, and reimbursement are aligned, EMS clinicians can move fluidly from emergency response to population-level prevention – precisely the operational agility required to embed routine HIV screening, risk stratification, and same-day linkage within the pre-hospital workflow.
Early proof-of-concept work demonstrates that front-line crews can safely integrate HIV diagnostics into routine field care. In Winnipeg, community paramedics embedded in a shelter–detox network completed 1,207 POC tests on 997 unique clients over 12 months; three undiagnosed infections were confirmed, and all were linked to specialist care within 48 hours, while test acceptability exceeded 90% among approached clients [29].
A subsequent emergency-department (ED) study, in which paramedics stationed in triage performed INSTI® finger-stick tests, found a 96% patient-reported satisfaction rate, with every reactive result (1.4% positivity) connected to HIV care within 24 hours [40].
More recently, a 2025 scoping review cataloged 40 ambulance-based POC assays across three continents; the authors concluded that HIV tests met the highest combined scores for diagnostic accuracy, patient acceptability, and potential system savings, yet identified “a research gap in implementation trials,” highlighting the need for scaled pilots in US EMS systems [41].
Economic modeling consistently shows that rapid testing attached to unscheduled care settings yields favorable value for money. A foundational analysis of ED screening estimated incremental costs of US $1,900–$9,000 per quality-adjusted life-year (QALY), well below customary US willingness-to-pay thresholds [42].
The multi-center TESTED pragmatic trial updated these figures using 2023-unit costs: enhanced, nurse-led screening delivered at break-even when local undiagnosed prevalence exceeded 0.08% and produced a cost per new diagnosis of US $20,800, competitive with cervical and colorectal cancer screening benchmarks [43].
Outside hospital walls, pharmacist-supervised POC testing proved dominant (more QALYs at lower lifetime cost) compared with both laboratory referral and mailed self-test strategies, largely by accelerating linkage by a median of 14 days and averting downstream transmissions [44]. Given that community paramedicine programs already share reimbursement codes with retail clinic models, these data are transferable: labor plus kit expenses are offset by reduced repeat 9-1-1 utilization, earlier viral suppression, and avoided tertiary care.
Collectively, these converging data, real-world pilots, robust cost-utility analyses, and favorable stakeholder views provide a persuasive rationale for embedding rapid HIV testing and immediate linkage services within EMS workflows.
A pre-hospital HIV-prevention protocol must ride in the slipstream of a routine 9-1-1 call, neither delaying transport for the acutely ill nor extending “treat-and-release” scene times beyond local benchmarks. The algorithm, therefore, divides the encounter into five tightly choreographed domains: triage, consent, concurrent testing + risk assessment, result disclosure + warm hand-off, and documentation/quality audit, each mapped to a discrete electronic patient-care record (ePCR) field so that crews can move from dispatch to departure in under 30 minutes (Table 1).
| Step | Task | Timestamp |
|---|---|---|
| Scene assessment | Primary survey: confirm non-life-threatening status; note blood-borne pathogen precautions. | 0–2 min |
| Offer and obtain consent | Explain the purpose and document verbal consent in the ePCR; for minors, follow the state statute regarding STI testing. | 2–4 min |
| Rapid test | Finger-stick (or oral fluid if the patient is unable to cooperate) using a CLIA-waived device; start the timer. | 4–6 min |
| Risk inventory | While the cassette develops, administer the 7-item CDC PrEP risk index in the ePCR template. | 6–10 min |
| Result disclosure and counseling | Deliver the result, reinforce “U=U,” and discuss the next steps; total face-to-face time <5 min. | 15–20 min |
| Warm hand-off | Positive: live video link to an HIV clinician for a same-day ART starter pack; negative/high-risk: e-referral to a PrEP navigator and SMS appointment confirmation. | 20–25 min |
| Departure | Dispose of sharps, label the specimen bag (if confirmatory draw), and complete the ePCR. | 25–30 min |
Operational workflow for pre-hospital HIV prevention during low-acuity EMS encounters.
The table outlines a time-sequenced protocol integrating rapid HIV testing, PrEP risk assessment, result disclosure, and electronic referral into routine paramedic practice. Each task is aligned with specific time benchmarks (0–30 minutes) to ensure prevention activities do not compromise emergency readiness.
By embedding consent scripts, risk scoring, and telenavigation into tasks crews already perform – vital-sign measurement, electronic charting, and medication reconciliation – the operational workflow preserves EMS response capacity while fulfilling public-health mandates for universal offer, rapid linkage, and robust data transparency.
The test cartridge that rides in the jump-bag must survive heat, jostling, and rapid turnover while still catching the earliest, most contagious phase of infection. Three contenders have proven they can do that, but they differ in nuances that matter once the doors of the ambulance close.
A laminated cheat-sheet clipped to the drug box summarizes window periods, sample types, run-times, and control-line colors so even relief crews can choose the right cartridge under the rig’s dome light. Both Determine™ and OraQuick® appear on the May 2025 CLIA-waived list, confirming that no additional laboratory license is needed for EMS deployment [62].
Field crews have neither the privacy nor the time to recreate a full sexual-history interview, yet missing a high-risk patient squanders the public-health value of the test-and-treat model. National policy, therefore, emphasizes brief, evidence-based risk stratification that can be embedded in any clinical encounter, including a curb-side visit or lift-assist call. The 2024 US Public Health Service guideline reiterates that PrEP should be “routinely discussed whenever HIV testing is offered, with initiation the same day if risk is confirmed,” adding that objective tools reduce provider bias and increase uptake among women and Black or Latino MSM [63]. Against that backdrop, EMS programs have adopted the CDC HIV incidence risk index (HIRI) because it can be scored while the cassette develops, it fits into the ePCR as seven yes/no taps, and it has been prospectively validated to predict seroconversion across diverse populations [64, 65].
Time on scene is precious, so the workflow uses the CDC HIRI – seven yes/no taps that auto-sum in the ePCR.
MSM and transgender women. A score ≥10 flags substantial risk; validation studies show that this threshold captures 80% of seroconversions within 36 months [52].
People who inject drugs: The adapted HIRI-PWID (≥9) includes questions on syringe sharing and recent overdose.
Heterosexual adults. Four binary triggers – known-positive partner, recent bacterial STI, exchange sex, or residence in a high-incidence ZIP code—collapse into a quick “Yes/No PrEP Discussed” field that avoids intrusive probing.
Large-system trials have shown that an EHR-embedded algorithm, applied retrospectively to 1.15 million visits, caught 87% of eventual seroconverters [66]. Importantly, that algorithm feeds back into the ePCR after the run, so even if the crew misses a high-risk cue, the patient still receives an auto-text inviting a PrEP televisit.
Testing without a rapid hand-off to treatment is an empty gesture. National cohort data show that every 30-day delay in ART initiation increases cumulative 12-month viremia by roughly 0.7 log-copies-day/mL, a metric tightly correlated with onward transmission [67]. Recognizing this, the WHO and HHS now define “effective testing services” as those that deliver either same-day ART or, for negative patients at substantial risk, a documented PrEP referral within one week [68]. EMS clinicians are uniquely positioned to close that loop in real time because they carry connected tablets, operate under medical direction, and already navigate patients to specialty care after stroke or STEMI alerts.
A flawless clinical algorithm can still collapse if cartridges expire unnoticed, lancets run dry, or used test cassettes pile up in unlabeled bins. Global implementation studies remind us that stock-outs, temperature excursions, and waste-management lapses are the leading reasons rapid-testing programs falter after pilot funding ends [71]. Domestic regulators are equally blunt: OSHA’s 2024 revision of the Bloodborne Pathogens Standard added specific citations for POC testing in non-hospital settings and raised fines for improper sharps disposal [72]. Integrating inventory dashboards, passive coolers in summer heat, and on-board red-bag liners is therefore not administrative trivia but the bedrock that protects staff, reassures patients, and sustains community trust.
Taken together, the workflow choreography (6.1), cartridge selection (6.2), risk-stratification rubric (6.3), real-time linkage pathways (6.4), and behind-the-scenes logistics (6.5) form a single, mutually reinforcing architecture. Each element has been mapped to an existing EMS data field, licensure rule, or supply-chain process so that no new bureaucracy is created; instead, familiar tools are repurposed to serve HIV prevention. By anchoring the protocol in implementation-science principles – intervention simplicity, compatibility with current practice, and quick-cycle feedback loops – agencies maximize the odds of faithful adoption and long-term survival in the often-turbulent EMS environment. Moreover, every step is paired with a measurable indicator (offer-rate, positivity, ≤7-day linkage, stock-out frequency), giving quality officers a Donabedian-style framework to monitor structure, process, and outcome without additional data entry [77, 78]. In short, Section 6 translates abstract prevention goals into an operational playbook that any ALS unit can carry into the field tomorrow, setting the stage for the evaluation strategy outlined in Section 11.
A sustainable pre-hospital HIV-prevention program is only as strong as the workforce that delivers it. Rigorous initial preparation, deliberate skills maintenance, and a transparent quality-improvement (QI) architecture create the closed learning loop required to keep field performance aligned with evolving science and regulatory expectations.
The 2021 National EMS Education Standards require that every level of clinician – from emergency medical responder to paramedic – receive instruction in public-health roles and POC diagnostics [79]. Building on that mandate, accredited paramedic programs now allocate a minimum of eight contact hours to communicable-disease screening, with four hours of didactic content (epidemiology of HIV, legal consent frameworks, PrEP eligibility algorithms, and linkage pathways) and four hours of laboratory-style psychomotor training that covers capillary sampling, cartridge handling, timer discipline, and scripted counseling. Competencies map to the CoAEMSP Appendix G skill matrix, ensuring uniform coverage across programs irrespective of delivery modality [80].
Interprofessional simulation further anchors learning. Hybrid scenarios that pair paramedic students with nursing or public-health learners in a mock living-room environment have been shown to improve checklist adherence for consent, testing, and warm hand-off by 24% points compared with lecture-only cohorts [81]. Programs that cannot fund high-fidelity manikins can replicate the gains with tabletop drills and wearable finger-stick task trainers, provided that facilitators employ structured debriefs linked to objective performance metrics.
Competency cannot be presumed to persist; it must be verified, refreshed, and documented. objective structured clinical examinations (OSCEs) remain the reference standard, demonstrating inter-rater reliabilities above 0.85 when stations include both technical (e.g., valid cassette interpretation) and communication domains [82]. Initial skill sign-off is followed by annual verification, either in person or through video-recorded submissions scored using the same rubric.
For continuing education, the National Registry of EMTs (NREMT) has incorporated HIV testing and PrEP counseling into the national continued competency program (NCCP) as an approved “public-health module,” counting for two of the 24 national hours required every biennium [83]. Providers may satisfy those hours through micro-learning packages accredited by CAPCE, synchronous simulation, or supervised field rotations [84]. Agencies that linked recertification to QI dashboards saw a 31% reduction in protocol-deviation reports over two years – evidence that education tied to real-world data closes performance gaps more effectively than didactic hours alone [85].
Quality assurance in pre-hospital HIV prevention pivots on accurate, real-time data. All major ePCR platforms already carry the NEMSIS v3.5.0 data elements for test offer (E18_13), patient acceptance (E18_14), result (E18_15), and linkage disposition (E20_12); agencies need only enable the fields and mandate completion [85]. Daily automated extracts populate dashboards that display offer-rates, positivity, median scene time, and ≤7-day linkage, mirroring the EMS Compass performance framework and allowing apples-to-apples comparison across jurisdictions [86].
Once populated, data drive a plan-do-study-act (PDSA) cycle at the monthly QI meeting: anomalous metrics trigger chart review, root-cause analysis, and targeted remediation, such as refresher drills or protocol tweaks [87]. Importantly, the same dataset feeds state and federal public-health partners, eliminating duplicate reporting and positioning EMS as a sentinel surveillance node. A multi-system evaluation found that paramedic crews who received quarterly, individualized feedback on their HIV-testing metrics improved correct cartridge handling from 88% to 97% within a single year [88, 89].
Finally, data stewardship is inseparable from confidentiality. Role-based access controls, automatic log-outs on mobile devices, and HL7-compliant encryption uphold HIPAA requirements while still permitting population-level analytics. Agencies that combine those safeguards with transparent communication to field crews cultivate trust and foster a culture in which quality assurance is perceived not as policing but as professional development.
Field deployment of HIV prevention by EMS personnel hinges on the scrupulous observance of health-information privacy. Because every transporting ambulance service that bills electronically is a “covered entity,” crews may use or disclose protected health information only for treatment, payment, or operations and must apply the “minimum-necessary” rule when speaking with law enforcement or other third parties [90]. Opt-out scripting (“We check everyone’s blood pressure and also test for HIV unless you prefer not to”) satisfies federal consent expectations while preserving scene efficiency, but EMS agencies still need a procedure for delivering the notice of privacy practices when circumstances permit [90].
Adolescents are a frequent pre-hospital touchpoint. All 50 states now permit some degree of self-consent for STI services, yet statutory details vary and can influence uptake. A multi-state analysis of youth risk behavior surveillance data showed that male students in jurisdictions explicitly allowing minor self-consent to HIV testing were 37% more likely to have been tested at least once [91]. Protocols must, therefore, embed a quick jurisdictional check (or a dispatch flag) so crews know when verbal assent is legally sufficient.
Culturally and linguistically appropriate interaction is not optional. The HHS National CLAS Standards outline 15 action steps, foremost among them the provision of communication in the patient’s preferred language, which EMS systems can adapt for curb-side use [92]. Qualitative work with Black gay and bisexual men in Baltimore found that a mobile, status-neutral testing van was perceived as markedly less judgmental than fixed clinics, largely because staff used inclusive language and avoided moralizing about risk behavior [93]. Integrating such stigma-aware scripts into paramedic training helps ensure that offers of testing or PrEP discussions are accepted rather than rebuffed [93].
Liability rests on matching practice to legal scope [94]. The 2021 National EMS Scope of Practice Model confirms that paramedics may perform CLIA-waived POC diagnostics and deliver intramuscular prophylaxis, provided medical direction is in place [94]. Nevertheless, experts warn that post-exposure follow-up, confirmatory venipuncture, and medication dispensing must follow state-approved algorithms to avoid allegations of practicing medicine without a license and to maintain Ryan White protections for providers [95]. Agencies should obtain a CLIA waiver, maintain sharps-safety plans, and secure explicit medical-director standing orders for every preventive intervention offered in the field.
Direct costs fall into three buckets: labor, consumables, and linkage infrastructure [96]. Time-motion studies place personnel expenses at roughly US $8.50 per encounter for counseling and documentation, while rapid-test kits account for another US $15–20, depending on volume pricing; together, they represent 70% of program spending [96]. One-off outlays, including eight hours of initial paramedic training, tablet licenses for secure telehealth, and sharps-disposal contracts, add about US $12,000 per ambulance in year 1 but fall sharply thereafter.
Reimbursement pathways already exist [97]. Nevada’s 2024 Medicaid State-Plan Amendment pays community-paramedicine CPT codes (99,341–99,350) at 63% of the Medicare non-facility rate and explicitly recognizes HIV screening and PrEP navigation as covered services [96, 97]. Similar 1,115 or 1915(c) waivers in 18 other states allow billing for non-transport preventive visits, converting what was once an unfunded mandate into a revenue-neutral operation.
Medications and laboratory follow-up can be financed through the federal 340B Drug-Pricing Program, which enables Ryan White clinics and FQHCs to purchase starter antiretroviral packs and PrEP generics at discounts exceeding 50% savings that agencies can pass on to uninsured patients [98]. At the macro level, the FY 2025 budget requests US $593 million for the EHE initiative, sustaining competitive grants that many EMS systems already tap for test kits, data analysts, and linkage navigators [99].
Scale-up also depends on enabling legislation. Forty-plus states now recognize mobile-integrated-health or community-paramedicine in statute, and rural-health guidance highlights these models as efficient ways to extend preventive services without duplicating clinic infrastructure [99]. Embedding HIV testing and PrEP referral into state EMS protocols and coupling them with the interstate practice privileges of the EMS Compact would lower administrative friction and normalize reimbursement, while federal agencies could accelerate adoption by tying EHE dollars to the inclusion of pre-hospital metrics (offer rate, ≤7-day linkage) in jurisdictional dashboards [100].
Field experience shows that front-line clinicians are generally sympathetic to the public-health value of curb-side HIV prevention, yet enthusiasm wanes when implementation threatens an already compressed workflow. In a large US ED survey, barely two-fifths of physicians and nurses said they could “usually” offer an HIV test once the program was underway; insufficient time, scarce follow-up resources, and uncertainty about who would deliver counseling topped the list of deterrents [101]. Community-paramedic data paint a more nuanced picture: crews value the deeper patient relationships and career diversity that preventive roles confer, but they flag the need for additional training and clear protocols so that new tasks do not erode response readiness [102]. These findings suggest that success hinges less on ideological resistance than on designing a workflow that respects scene-time benchmarks, offers just-in-time decision support, and rewards crews for preventive effort.
Programs flourish when EMS agencies are not left to shoulder linkage and follow-up alone. State community-paramedicine statutes now permit formal co-management agreements with health departments, federally qualified health centers, and harm-reduction organizations, giving crews a ready referral spine and, increasingly, a reimbursement pathway [103]. On the technical front, the NEMSIS/IHE Interoperability task force has produced implementation guides that let ePCRs auto-populate hospital electronic-health-records and pull discharge data back to EMS in real time [104]. Such bidirectional exchange short-circuits the “black-hole” problem in which paramedics never learn patient outcomes, and it supplies public-health partners with granular metrics – offer rate, acceptance rate, linkage within seven days – without duplicate data entry.
A growing number of EMS pilots have turned to structured implementation science to move from charismatic champion projects to scalable, system-wide programs. The consolidated framework for implementation research (CFIR) offers a diagnostic lens for pre-launch analysis; its constructs highlight, for example, how compatibility with existing scope-of-practice rules or perceptions of task complexity will condition uptake [105]. Once operations begin, the RE-AIM heuristic translates daily run-sheet numbers into the five domains: reach, effectiveness, adoption, implementation fidelity, and maintenance, which funders and regulators most often request [106]. Using CFIR for formative assessment and RE-AIM for summative monitoring creates a coherent narrative arc from initial feasibility to long-term sustainability and brings EMS-based HIV prevention into the same evaluative vocabulary used by health-system partners.
A credible evaluation begins with meticulous documentation of the activity itself, establishing whether preventive services were offered, accepted, and completed under routine operational conditions. Every metric should flow automatically from the ePCR so that field crews are not distracted by extra data entry. The program should, therefore, compute in real time the proportion of eligible encounters in which an HIV test or PrEP counseling was offered, the percentage of offers that culminated in a completed rapid-test, the fraction of tests that pass quality-control checks, and the share of high-risk negatives who depart the scene with a live electronic referral rather than a paper brochure. Scene-time added per intervention and overall ambulance-turnaround times must be tracked concurrently to ensure that the preventive layer is not compromising emergency readiness.
Once the operational machinery is running smoothly, attention shifts to the patient-centered consequences of the intervention. Immediate outcomes include confirmation of reactive results within 24 hours, initiation of PrEP within 30 days for those at ongoing risk, and documented acceptance of risk-reduction counseling. Intermediate biomedical outcomes, such as antiretroviral initiation, 90-day PrEP adherence, and 6- or 12-month viral-suppression rates, demonstrate clinical effectiveness, while system-level outcomes, such as reductions in community HIV incidence or ED revisits for preventable sexually transmitted infections, place the program’s impact in a public-health context. Achieving these linkages requires data-sharing agreements with public-health surveillance systems and pharmacy benefit managers so that laboratory results and prescription fills can be integrated with EMS datasets.
Aggregate success can mask systematic gaps, so every dashboard must disaggregate process and outcome indicators by race, ethnicity, gender identity, risk category, and geography. Comparing uptake among young Black MSM, for example, to the underlying county demographics quickly reveals whether the intervention is reaching the communities at highest risk. Additional stratification by insurance status, homelessness markers, or area deprivation index quintile highlights socio-economic barriers that might be amenable to partner engagement, language adaptation, or targeted refresher training for crews.
The choice of study design should reflect program maturity and ethical considerations. Early pilots benefit from rapid-cycle “plan–do–study–act” loops that debug logistics over successive three-month intervals. Cluster-randomized trials, in which stations or regions alternate between intervention and usual care, allow robust causal inference without contaminating individual crews. Where withholding preventive care is politically untenable, a stepped-wedge design staggers roll-out across districts, creating internal controls while guaranteeing eventual access for all. Hybrid effectiveness-implementation designs, which measure both patient outcomes and implementation determinants, accelerate translation from pilot to scale. Coupling these designs with complementary economic analyses – cost-per-diagnosis, cost-per-PrEP start, and budget-impact projections – provides the fiscal narrative policymakers need to sustain the service.
Emerging cartridge platforms that bundle HIV, syphilis, hepatitis C, and even chlamydia or gonorrhea assays promise to turn the ambulance into a mobile infectious-disease clinic. Before that vision can be realized, field studies must confirm cartridge stability at desert-summer temperatures, quantify operator-error rates while the vehicle is in motion, and determine whether multi-analyte testing improves linkage efficiency or merely lengthens scene time. Reimbursement coding and CLIA categorization for multi-plex devices also remain unsettled and warrant policy analysis.
Communities that have invested in EMS-led HIV services already possess trained personnel, secure data pipelines, and cooperative agreements with public-health agencies; assets that could be leveraged for hypertension screening, naloxone distribution, or diabetic-retinopathy photography. Comparative-effectiveness studies are needed to discover whether bundling modules creates economies of scope or diffuses focus. Researchers should examine cross-training efficiencies, supply-chain synergies, and the tipping point at which additional complexity begins to erode emergency response capacity.
Automated e-referral platforms can deliver encounter data to clinics in real time, offer patients a menu of appointment slots, and return confirmation messages to EMS dashboards. Smartphone-based adherence tools can push daily PrEP reminders, facilitate side-effect reporting, and alert navigators to missed doses. Future work must scrutinize privacy safeguards for geolocation and medication data, evaluate usability across age and literacy strata, and measure the incremental improvement in linkage and adherence relative to analog approaches.
Low- and middle-income countries frequently rely on non-physician ambulance crews and operate without robust electronic data systems. Adaptation studies should explore solar-powered refrigeration, paper-based data capture with deferred mobile upload, and simplified counseling scripts tailored to multi-lingual, low-literacy populations. Regulatory research is needed to clarify task-shifting authority for finger-stick testing and to map pathways for over-the-counter PrEP starter packs. Cost-utility models must incorporate commodity pricing, transit times, and differing disease burdens to determine when a pre-hospital prevention model is fiscally and operationally feasible.
EMS, long regarded solely as a bridge between the scene and the hospital, now stand poised to become a crucial first line of HIV prevention. This chapter traced that evolution from epidemiological imperative to a detailed implementation roadmap. We began by underscoring the persistent disparities in US HIV incidence, particularly among Black and Latino MSM, people who inject drugs, and residents of the rural South, and showed how delays in diagnosis and linkage perpetuate those gaps. Against that backdrop, we argued that the ubiquity, mobility, and public-trust capital of EMS create a uniquely powerful platform for rapid testing and PrEP navigation.
Subsequent sections translated that premise into practice. We reviewed the regulatory landscape, CLIA waivers, state community-paramedicine statutes, and the EMS Compact, demonstrating that paramedics already possess the legal authority to perform POC diagnostics and deliver prophylactic injections under medical direction. We then detailed an operational workflow that inserts a 15-minute HIV testing and PrEP-screening module into low-acuity calls without compromising scene times, and we matched each task to specific NEMSIS data elements to ensure transparent quality monitoring. Technology selection guidance balanced analytic sensitivity with rugged field performance, while risk-stratification tools and telehealth “warm hand-offs” closed the loop from finger-stick to same-day ART or PrEP referral.
Implementation, of course, hinges on people and systems. Provider-acceptance studies remind us that enthusiasm wilts when workloads swell, so the design leans on concise consent scripts, auto-populated ePCR fields, and bidirectional data exchange that feeds results back to crews and public-health partners alike. The chapter mapped these realities onto the CFIR for pre-launch diagnostics and the RE-AIM rubric for ongoing evaluation, ensuring that programs are not only built but also sustained. Economic modeling showed that, once reimbursement pathways such as Medicaid community-paramedicine codes and 340B drug pricing are tapped, curb-side prevention can be cost-neutral or even cost-saving in jurisdictions with moderate HIV prevalence.
Finally, we set out a multi-tiered evaluation plan: process, outcome, and equity indicators, alongside rigorous research designs ranging from rapid-cycle pilots to stepped-wedge trials. Future horizons include multi-plex STI cartridges, expansion into chronic-disease prevention under the MIH banner, digital adherence tools, and adaptations for low-resource ambulance systems worldwide.
In sum, mobilizing pre-hospital HIV prevention is neither speculative nor marginal; it is an evidence-based, operationally feasible strategy that aligns perfectly with the “diagnose” and “prevent” pillars of the national EHE initiative. By embedding rapid testing, risk triage, and same-day linkage into everyday EMS practice, communities can compress the diagnostic window, accelerate viral suppression, and extend PrEP to those who would otherwise slip through clinical cracks. The path forward is clear: leverage existing statutes, integrate seamless data flows, invest in targeted crew training, and rigorously measure both reach and equity. If stakeholders act on the blueprint detailed in this chapter, ambulances will do more than transport patients; they will carry the epidemic one step closer to its end.
The authors declare no conflict of interest.
Submitted: 31 July 2025 Reviewed: 08 August 2025 Published: 17 February 2026
© 2026 The Author(s). Licensee IntechOpen. This content is distributed under the terms of the Creative Commons Attribution 4.0 International License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
