Syphilis cases in Mercer County are about 35% lower than the US average. In Princeton, New Jersey, whether you're seeking a one-time check or regular screenings, you have two main options. Clinics may bill insurance or offer sliding-scale fees, while many private labs let you pay a flat self-pay price. These options are listed below.
Available testing centers
12 testing options are listed for Princeton, NJ. The nearest, Labcorp, is about 1.1 miles away. Compare community and public clinics, private labs, and at-home kits below.
Listings tagged Community health center are federally funded health centers and rural clinics that treat everyone regardless of insurance or ability to pay: required to bill on a sliding fee scale and provide confidential care, and in many states minors may consent to their own STI testing. A Title X tag flags centers funded for confidential family-planning services; confirm current participation when you call.
Source: CMS FQHC & Rural Health Clinic enrollment files (data.cms.gov), refreshed quarterly. Title X status reflects the latest OPA grantee list.
Zufall Health Plainsboro, a federally qualified health center in Plainsboro, ties sliding-scale fees to each patient's income: meaning STI screening for syphilis, gonorrhea, and chlamydia is financially within reach across a wide income range. Title X status extends legally confidential family-planning services to minors.
Tests offered
Fees & payment
ID Care in Princeton covers gonorrhea, chlamydia, syphilis, herpes, HIV, and hepatitis A, B, and C testing, with same-visit treatment for bacterial infections. Appointments are required, and fees are charged on a sliding scale.
Many clinics offer interpretation only at intake, leaving clinical conversations unmediated. At ID Care, interpretation services are available across non-English languages throughout care, so the exam, the diagnosis, and the follow-up plan all happen in the language a patient actually uses to make decisions.
ID Care prescribes both PrEP and PEP directly, which means ongoing HIV prevention and time-sensitive post-exposure medication are managed by the same clinical team handling testing and treatment. No separate provider, no gap in continuity.
Plenty of clinics will test for hepatitis C and leave the rest to a specialist elsewhere. ID Care carries the full arc, hepatitis B and hepatitis C treatment are both delivered on-site, so a confirmed diagnosis moves directly into a managed treatment plan at the same practice.
Languages
English, Interpretation Services Available for Non-English Languages
Tests offered
Serves
Care services
Prevention services
Fees & payment
Listing verified May 2026 · Source: CDC NPIN
Henry J. Austin Health Center at All Access Mental Health in Princeton extends its federally qualified reach to anyone navigating gaps in coverage or paying out of pocket. Sliding-scale fees adjust to income, and STI screening covers syphilis, gonorrhea, and chlamydia. No appointment needed.
Tests offered
Fees & payment
Penn Medicine in Cranbury accepts Medicaid, Medicare, and private insurance for STI care, with fees scaled to what insurance covers. The standard panel spans HIV, syphilis, gonorrhea, chlamydia, herpes, hepatitis B, hepatitis C, and TB, appointments required, with same-visit treatment for bacterial infections and care delivered in Spanish.
Penn Medicine's Cranbury clinic doesn't hand off hepatitis C after a positive antibody result: physicians here prescribe antivirals, monitor viral load through treatment, and manage the full course on-site. No separate specialist, no gap between detection and care.
Prevention prescribing, both PrEP for ongoing HIV risk and PEP for post-exposure situations, isn't commonly offered at standalone testing clinics, which often leave patients to track down a prescriber separately. Penn Medicine Cranbury handles both, keeping prevention and testing under the same clinical relationship.
Care at Penn Medicine Cranbury is delivered directly in Spanish, which means medical history, treatment options, and follow-up instructions are exchanged without an intermediary. A difference that sharpens accuracy and comfort across the whole visit.
Languages
English, Spanish
Tests offered
Serves
Care services
Prevention services
Fees & payment
Listing verified Apr 2026 · Source: CDC NPIN
Henry J. Austin Health Center-Nottingham, in Trenton, earns its federal qualification partly by tying fees to what patients actually earn. No one is turned away for inability to pay. Walk-in STI screening covers syphilis, gonorrhea, and chlamydia at that income-based sliding scale.
Tests offered
Fees & payment
Hamilton Township Division of Health in Hamilton takes walk-ins for its full testing menu (gonorrhea, chlamydia, syphilis, rapid and conventional HIV, hepatitis B and C, herpes, and TB) plus same-visit treatment for bacterial infections, with every test and service provided at no fee.
The Division of Health operates on a no-fee structure that isn't limited to a subset of services or income tiers: testing, treatment, vaccines, and counseling are all billed at zero dollars. That means the Mpox, HPV, and hepatitis A and B vaccines carry the same cost as the HIV test: nothing.
Interpretation services are available for non-English languages, which means clinical conversations (exposure history, medication adherence counseling, test results) happen in full rather than in abbreviated English. Counseling that depends on nuance isn't compromised by a language gap.
Beyond gonorrhea, chlamydia, syphilis, and HIV, Hamilton Township tests for herpes, hepatitis B, and hepatitis C in the same visit. Meaning infections that often go undetected for years are caught at the same appointment rather than requiring a separate referral to a different provider.
Languages
English, Interpretation Services Available for Non-English Languages
Tests offered
Serves
Care services
Prevention services
Fees & payment
Listing verified May 2026 · Source: CDC NPIN
Planned Parenthood of Northern Central and Southern New Jersey in Hamilton Square delivers rapid HIV, syphilis, gonorrhea, chlamydia, herpes, hepatitis B, and hepatitis C testing on a sliding-scale fee, with same-visit treatment for bacterial infections and no appointment required. In Spanish or through interpretation for other languages.
For anyone navigating STI care primarily in Spanish, or in any language other than English, this clinic in Hamilton Square conducts the full visit, from risk assessment to treatment decisions, with Spanish-speaking staff and interpretation services for other languages. The clinical conversation stays direct and complete, never filtered through a secondhand relay.
Standard family planning offices routinely defer younger patients or require parental involvement for sensitive services. Planned Parenthood of Northern Central and Southern New Jersey operates under Title X, which legally guarantees confidential family planning and STI services for minors. A protection most providers in the area simply aren't structured to offer.
Both PrEP and PEP are prescribed directly at this Hamilton Square location, not coordinated through an outside provider. PrEP requires ongoing HIV and kidney monitoring, and carrying that relationship in-house means the prescribing clinician tracks labs and adjusts care without handoffs between offices.
Languages
English, Interpretation Services Available for Non-English Languages, Spanish
Tests offered
Serves
Care services
Prevention services
Fees & payment
Listing verified Jan 2026 · Source: CDC NPIN
Henry J. Austin Health Center at the Rescue Mission of Trenton earns its federally qualified designation partly by tying STI screening fees to each patient's actual income: meaning syphilis, gonorrhea, and chlamydia testing stays within reach regardless of what someone earns. No appointment is needed to get started.
Tests offered
Fees & payment
Free tool · not a clinic
Testing too soon can miss an infection. Enter the date of possible exposure to see the earliest a test can reliably detect each STI.
| Infection | Earliest reliable test | Conclusive after |
|---|---|---|
| Chlamydia | 7 days after exposure | 14 days after exposure |
| Gonorrhea | 7 days after exposure | 14 days after exposure |
| Trichomoniasis | 7 days after exposure | 28 days after exposure |
| HIV (NAT / RNA) | 10 days after exposure | 33 days after exposure |
| HIV (4th-gen Ag/Ab) | 18 days after exposure | 45 days after exposure |
| HIV (antibody) | 21 days after exposure | 84 days after exposure |
| Syphilis | 21 days after exposure | 42 days after exposure |
| Hepatitis B | 21 days after exposure | 42 days after exposure |
| Hepatitis C | 56 days after exposure | 77 days after exposure |
| Herpes (HSV) | 28 days after exposure | 112 days after exposure |
Guidance only, confirm timing with a clinician. A negative result before the conclusive date may need a repeat test.
Typical out-of-pocket ranges by option, actual cost depends on which tests you need.
Public / community clinic
Free HIV testing is common
Private lab (self-pay)
Never billed to insurance
At-home kit
Mailed to your door, private
Doctor / urgent care
Often $0 preventive with insurance
No centers match those filters. Clear the service-type filter or the opening-hours filters to see every center.
Every other option
Beyond the dedicated testing centers above: at-home kits by mail, hospital labs certified for STI testing, local clinicians who can order a panel during a regular visit, pharmacies for self-test kits and prescriptions, and online PrEP & treatment.
Test from home
The nearest testing center is about 1 mile away; if you'd rather skip the trip, an at-home kit ships to Princeton, you collect the sample privately, and mail it back to a CLIA-certified lab. Results come online in days, with a clinician available if anything is positive. Same labs as a clinic, no waiting room, and you can read how accurate at-home STD tests are before you order.
Want a free option first? The CDC-supported TakeMeHome (opens in a new tab) program mails free at-home HIV self-test kits, and, in many areas, free STI kits, to your door, with no insurance or payment needed. The paid kits below add broader panels and faster turnaround.
In-home collection
$79 & up
Best range: couples & full panels
$79 & up
Best value: single tests
$49 & up
Every kit uses CLIA-certified labs. At-home testing is for screening; a reactive result should be confirmed and treated by a clinician. Prices and panels shown are illustrative and change often, confirm current details on the provider's site.
Also in the area
Beyond the public testing sites above, these federally certified (CLIA) labs serve Mercer County, each lab's town is shown on its card below. Many test through a doctor's order or by appointment rather than walk-in, so call ahead to confirm STD/STI testing and availability before visiting.
Route 206 And Provinceline Road, Princeton, NJ 08540
CMS-certified lab Accredited · College of American Pathologists
16 Chambers Street, Princeton, NJ 08542
CMS-certified lab Accredited · College of American Pathologists
12 Roszel Road, Princeton, NJ 08540
CMS-certified lab Accredited · College of American Pathologists
419 North Harrison Street, Princeton, NJ 08540
CMS-certified lab
104 Carnegie Center Drive, Princeton, NJ 08540
CMS-certified lab
Showing the nearest 5 CLIA-certified labs.
Source: CMS CLIA registry (Provider of Services), Q1 2026. Federal public records: active CLIA-certified laboratories near Princeton. A CLIA certificate records only that a laboratory is federally certified — it does not confirm the site performs STD testing, nor its hours, price or access. Inclusion is not an endorsement; always call to verify.
Local clinicians
Beyond dedicated clinics, 3,482 primary-care, OB-GYN, infectious-disease and other clinicians have a CMS practice record within 30 miles of Princeton. They may be able to evaluate symptoms or order a confidential STD panel during a regular visit, and 1,309 offer telehealth.
Emma Lundsmith, MD Telehealth
Internal medicine · 300 Witherspoon Street, Princeton
Nayna Doniparthi, DO Telehealth
Family medicine · 419 North Harrison Street, Princeton
Peter Murphy, DO Telehealth
Internal medicine · 601 Ewing Street, Princeton
Brian Shaffer, MD
Internal medicine · 601 Ewing St Building A, Princeton
Yana Markidan, MD
OB-GYN · 601 Ewing Street, Princeton
David Barile, MD
Internal medicine · 566 Princeton Kingston Road, Princeton
These are registry-listed clinicians, not dedicated STD-testing clinics. CMS records do not independently verify current licensure, testing services, availability, price, or new-patient status. Confirm each detail before booking. Source: CMS Doctors & Clinicians.
Nearby pharmacies
No pharmacy near Princeton, NJ publishes an STD-related service or holds a current CLIA testing certificate, so these are simply the closest. Contact a location directly to confirm counter hours, services, prices, and availability before visiting.
The Forer Pharmacy
0.4 miPrinceton Pharmacy
0.6 mi
0.8 mi Sante Integrative Pharmacy
0.9 mi
1.0 mi Showing the 5 closest pharmacies to Princeton, NJ.
Directory records identify nearby pharmacies. Service, stock, price, and hours information is shown only when supported by current location-specific evidence.
Prevention & treatment
Testing is one step. For residents of Princeton, telehealth covers the rest: HIV-prevention medication (PrEP) and DoxyPEP to lower future risk, and discreet online treatment if a result comes back positive. All prescribed by licensed U.S. clinicians.
Visit from $0 insured
Telehealth STI treatment and sexual-health care, delivered or to your pharmacy
$0 with most insurance
Free online PrEP & DoxyPEP: HIV prevention, home lab kits, no in-person visit
From $0 insured
Telehealth PrEP & DoxyPEP with at-home testing and ongoing monitoring
Visit from $39
Online STI treatment & DoxyPEP: same-day prescriptions to your pharmacy
Pricing varies by insurance and changes often, confirm on the provider's site. These services are not a substitute for emergency care.
STD stats & rates
How reported STI rates in Mercer County, the county that includes Princeton, compare with New Jersey and U.S. averages, based on the most recent 2023 surveillance data. An estimated ~41% of residents are aged 15–34 (ACS), the age group with the highest reported chlamydia and gonorrhea rates nationally.
#4 of 21 New Jersey counties for chlamydia, a higher rate than 81% of the state
| Infection | Mercer County | New Jersey | United States |
|---|---|---|---|
| Chlamydia | 505.4 1,929 cases ▲ 32% | 384.1 | 492.2 |
| Gonorrhea | 139.4 532 cases ▲ 28% | 109.1 | 179.5 |
| Syphilis (P&S) | 10.2 39 cases ▲ 26% | 8.1 | 15.8 |
| Syphilis (early) | 11 42 cases ▲ 6% | 10.4 | 16 |
| Syphilis (late/unknown) | 19.4 74 cases ▲ 21% | 16 | 29.5 |
Rates per 100,000 population, 2023. Source: CDC NCHHSTP AtlasPlus (county, state & U.S., all-ages basis). Population figures: U.S. Census Bureau ACS. These figures are the latest available surveillance estimates. Bars are scaled to the highest rate shown.
Reading these numbers: reported case rates only count infections that were actually tested for and diagnosed, so they track local screening effort as much as true spread: a higher rate can reflect more testing, a lower one less. Either way, most STIs cause no symptoms, so treat the figures above as context rather than a verdict, and test on the CDC's schedule regardless of how your area looks.
Between 2020 and 2023 in Mercer County, chlamydia has risen from 408.7 to 505.4 per 100,000 (24%), gonorrhea has fallen from 151.8 to 139.4 per 100,000 (8%), and P&S syphilis has risen from 8.3 to 10.2 per 100,000 (23%).
The 2020 dip reflects reduced pandemic-era screening, not lower transmission. Source: CDC NCHHSTP AtlasPlus (county, state & U.S., all-ages basis).
Community health context
Sources: CDC PLACES (ZIP), County Health Rankings, CDC/ATSDR SVI, HRSA HPSA, HRSA MUA/P, Neighborhood Atlas ADI. Lower insurance coverage, fewer routine checkups, and a thin primary-care ratio all raise the value of low-cost public clinics and at-home testing in Mercer County.
Local HIV snapshot
Mercer County HIV care continuum (2023)
Mercer County recorded 18 new HIV diagnoses per 100,000 (2023), against 11.9 statewide and 13.7 nationally. Among Mercer County residents living with HIV, 71.5% are in care · 63.6% are virally suppressed. Early, routine testing is what moves these numbers: it is the entry point to PrEP, treatment, and viral suppression.
Sources: AIDSVu (Emory/Gilead) · CDC AHEAD · CDC AtlasPlus · CDC NCHHSTP AtlasPlus (county care continuum). The CDC recommends everyone aged 13–64 test for HIV at least once: every lab and clinic listed above offers HIV testing, and free rapid HIV testing is available at a local health department.
Congenital syphilis, passed from parent to baby in pregnancy, is the fastest-rising STI in the country. U.S. cases climbed from 2,163 in 2020 to 3,882 in 2023. It is almost entirely preventable: the CDC recommends a syphilis test at the first prenatal visit, and every clinic and lab listed for Mercer County tests for syphilis.
Source: CDC NCHHSTP AtlasPlus, 2023 (county-level congenital syphilis is not published).
Local resources & officials
Data & references
Local context
Witherspoon-Jackson draws a mix of longtime residents and newer arrivals, many of them graduate students and early-career professionals whose schedules run on semester rhythms rather than nine-to-five ones. With nearly three in five residents in the labor force and a meaningful share working in research, academia, or university support roles, the practical window for a clinic visit can be narrower than it looks on paper. That scheduling reality matters because Princeton skews young in ways the broader county STI data reflect.
The large share of people in their late teens and twenties living along Nassau Street or closer to the Institute Area represents exactly the stretch of life when relationship patterns shift most and when routine screening tends to fall off, not from indifference but from a calendar that rarely opens on its own. Homeownership here is the norm for a majority of households, yet a substantial renting population, many paying rents in the range that demands a second job or unpredictable hours, faces the same time-cost equation as anywhere else.
Getting there
At 9.67/20 on the EPA walkability index, day-to-day errands in Princeton generally mean driving: plan on a car or rideshare to reach a clinic, and check each listing's hours and phone before you go.
Source: EPA National Walkability Index 2021.
ZIP 08540 snapshot
ZIP-level Census figures for the wider 08540 area around Princeton: a single ZIP can span several communities, so they describe the area, not Princeton alone.
Princeton sits in Mercer County, ZIP 08540. Local context that shapes where residents test:
Local landmarks
Neighborhoods & communities
Major routes
Nearby cities & towns
Just outside Princeton? These nearby communities have their own testing guides: clinics, at-home kits, and free screening close to home.
Reference
Everything to know before you test in Mercer County: the CDC's screening guidelines, each infection's detection window, per-test reference prices, and your privacy rights under New Jersey law. If you have symptoms right now, our confidential symptom checker maps them to the tests worth considering.
Based on current CDC screening recommendations.
| Group | Tests | How often |
|---|---|---|
| Everyone aged 13–64 | HIV | At least once |
| Sexually active women under 25 | Chlamydia, gonorrhea | Every year |
| Women 25+ with new or multiple partners | Chlamydia, gonorrhea | Every year |
| Pregnant people | HIV, syphilis, hepatitis B & C, chlamydia | Early in pregnancy |
| Gay & bisexual men (MSM) | Chlamydia, gonorrhea, syphilis, HIV | Every 3–6 months |
| Anyone who shares injection equipment | HIV, hepatitis B & C | At least yearly |
| All adults at least once | Hepatitis C | At least once |
Testing too early can return a false negative, confirm timing with a Princeton-area provider.
| Infection | Earliest reliable test | Sample |
|---|---|---|
| Chlamydia | 1–2 weeks | Urine or swab |
| Gonorrhea | 1–2 weeks | Urine or swab |
| Trichomoniasis | 1–4 weeks | Urine or swab |
| HIV (NAT / RNA) | 10–33 days | Blood |
| HIV (4th-gen Ag/Ab) | 18–45 days | Blood |
| HIV (antibody) | 3–12 weeks | Blood / oral |
| Syphilis | 3–6 weeks | Blood |
| Hepatitis B | 3–6 weeks | Blood |
| Hepatitis C | 8–11 weeks | Blood |
| Herpes (HSV) | 4–16 weeks (antibody); swab a sore | Blood / swab |
These are the federal Medicare reference prices for processing each lab test. Public clinics and the community health centers serving Princeton often test free or on a sliding scale; private labs and at-home kits bundle several tests into one fee. Use this as a per-test benchmark before you pay out of pocket, or see the full guide to STD test costs for insurance, free, and at-home options.
| Test | Reference price | CPT / HCPCS |
|---|---|---|
| Chlamydia (NAAT) | $47.80 | 87491 |
| Gonorrhea (NAAT) | $47.80 | 87591 |
| Trichomoniasis (NAAT) | $47.76 | 87661 |
| HIV-1/2 antigen/antibody | $26.87 | 87389 |
| HIV-1/2 antibody | $22.44 | 86703 |
| Syphilis (RPR/VDRL) | $5.61 | 86592 |
| Syphilis (treponemal antibody) | $17.49 | 86780 |
| Herpes (HSV NAAT) | $47.76 | 87529 |
| Hepatitis B surface antigen | $15.33 | 87340 |
| Hepatitis C antibody | $29.16 | 86803 |
Source: Medicare Clinical Laboratory Fee Schedule, CMS, 2025 rates (data.cms.gov). Reference rate for the lab assay only: a clinic visit, sample collection, or a bundled multi-test panel may cost more. Medicaid and most insurers cover STD screening at no out-of-pocket cost.
Two things that actually depend on New Jersey law: who can consent, and whether partners can be treated without their own visit. Everything else about testing privately is the same nationwide (see below).
In New Jersey, a minor can consent to confidential STI testing and treatment at any age, and to HIV testing at age 13 or older; a provider may notify a parent, and must do so where sexual assault is involved.
New Jersey permits Expedited Partner Therapy (EPT): if you test positive for chlamydia or gonorrhea, your provider can give you medication (or a prescription) to pass to your partner, no separate exam or appointment needed for them.
Keeping a test private works the same in every state. Whether an STD test shows on insurance (the EOB), how to test anonymously, and self-pay options that leave no insurance trail don’t change by location.
Learn more about confidential STD testing in New JerseySource: Guttmacher Institute, Minors' Access to STI Services; CDC, Legal Status of Expedited Partner Therapy. General information, not legal advice.
Good to Know
Answers to the questions people ask most before getting tested.
There are 12 options within a 30-mile drive.
Yes, Medicaid typically covers it, and public clinics are free either way.
Yes, free HIV testing is available at public clinics in the area.
A full panel typically covers chlamydia, gonorrhea, syphilis, HIV, and hepatitis B and C.
Mercer County reported ~505 chlamydia cases per 100,000 in 2023, above the New Jersey average.
At-home kits mail to 08540: self-collect, send to the lab, results in ~2–5 days.
Yes, PrEP, a daily pill that helps prevent HIV in HIV-negative people, is available in the area.
In New Jersey, people under 18 can consent to confidential STD testing and treatment on their own.
Most results are ready in about 1–2 days.
It can; oral HSV-1 transmits to the genitals during oral sex.
Have a different question? Browse the full STD & STI FAQ library, every question we answer, in one place.