Reported syphilis in Stanislaus County runs about 55% higher than the US average. For your first screening or a routine test in Modesto, California, consider if you prefer convenience or flexibility. Some clinics take walk-ins, while labs and at-home kits fit your schedule.
Available testing centers
11 testing options are listed for Modesto, CA. The nearest, Quest Diagnostics, is about 0.1 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.
GVHC - West Modesto, in Modesto, earns its federal qualification by anchoring care for patients paying out of pocket, between insurance coverage, or simply stretching a tight budget. Sliding-scale fees make syphilis, gonorrhea, and chlamydia screening reachable for anyone who walks in, no appointment needed.
Tests offered
Fees & payment
Golden Valley Health Centers in Modesto tests for gonorrhea, chlamydia, syphilis, and HIV, rapid and conventional, on a sliding scale with no-cost options, by appointment, and treats bacterial STIs the same visit.
Every service at Golden Valley carries no fee, which means the cost of testing, treatment, and vaccination lands at zero. Leaving no financial reason to delay a return visit or skip a follow-up vaccine dose.
Care at Golden Valley Health Centers is delivered in Spanish, so every clinical conversation, from test results to PrEP counseling, happens with the precision that medical detail requires.
Without a clinic that prescribes both PrEP and PEP directly, prevention can stall into a separate specialist visit and a gap in coverage. Golden Valley Health Centers writes both prescriptions in-house, keeping ongoing HIV prevention on a single, uninterrupted track.
Languages
English, Spanish
Tests offered
Serves
Care services
Prevention services
Fees & payment
Listing verified Jan 2026 · Source: CDC NPIN + HRSA
Stanislaus Health Services Agency in Modesto tests for gonorrhea, chlamydia, syphilis, herpes, hepatitis B, hepatitis C, and HIV, bacterial infections treated the same visit, with fees on a sliding scale and no appointment required.
Stanislaus Health Services Agency delivers testing, counseling, and STI treatment in Cambodian/Khmer and Spanish. Not through an auxiliary line but as part of the clinical encounter itself. For someone navigating a gonorrhea diagnosis or a hepatitis B result in a second language, that means the conversation about treatment adherence and partner notification happens without anything lost between speaker and provider.
Skipping herpes or hepatitis C from a panel means a separate appointment elsewhere, another scheduling delay before any treatment decision can be made. At Stanislaus Health Services Agency, the panel extends beyond gonorrhea, chlamydia, syphilis, and HIV to include herpes, hepatitis B, hepatitis C, and TB, closing those gaps in a single visit.
Languages
Cambodian/Khmer, English, Spanish
Tests offered
Serves
Care services
Prevention services
Fees & payment
Listing verified Mar 2026 · Source: CDC NPIN
GVHC - Modesto Mission Health Center in Modesto carries federal qualification that anchors its sliding-scale fee structure, adjusting costs to income so no one is turned away for inability to pay. Walk-ins are welcome for STI screening covering syphilis, gonorrhea, and chlamydia.
Tests offered
Fees & payment
Planned Parenthood Mar Monte in Modesto pairs full STI testing (gonorrhea, chlamydia, syphilis, herpes, and rapid or conventional HIV) with family planning under sliding-scale fees accepted alongside Medicaid, Medicare, and private insurance. Appointments are required, and bacterial infections can be treated same visit. Spanish and interpretation services extend care across languages.
Spanish is a working clinical language here, not a workaround, and live interpretation covers additional languages beyond that. The practical consequence: counseling, PrEP education, treatment instructions, and follow-up planning are all conducted in the language a patient actually uses. With no content filtered through a secondary step.
Title X federal funding is the specific mechanism that makes confidential family planning services for minors legally enforceable here, not a policy preference but a program requirement. That designation covers STI testing and contraceptive services, meaning results and treatment are not disclosed to a parent or guardian.
Many sexual health clinics test for HIV but leave PrEP prescribing to a primary care physician, a separate relationship a patient may not have. Planned Parenthood Mar Monte initiates and manages PrEP directly, and PEP is also available, keeping prevention and testing with one clinical team.
Languages
English, Interpretation Services Available for Non-English Languages, Spanish
Tests offered
Serves
Care services
Prevention services
Fees & payment
Listing verified Aug 2025 · Source: CDC NPIN
Modesto Florida Ave Center, in Modesto, carries federal qualification that anchors its sliding-scale fee structure: what you pay is tied to your income, and inability to pay is never a barrier. Walk-ins welcome for syphilis, gonorrhea, and chlamydia screening.
Tests offered
Fees & payment
GVHC - Modesto Womens and in Modesto, welcomes walk-ins for STI screening without an appointment. Federal qualification backs its sliding-scale fees, so a single visit can cover syphilis, gonorrhea, and chlamydia testing with costs adjusted to your income.
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 less than a mile away; if you'd rather skip the trip, an at-home kit ships to Modesto, 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 value: single tests
$49 & up
Best range: couples & full panels
$79 & 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 Stanislaus 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.
1441 Florida Avenue, Modesto, CA 95350
CMS-certified lab Accredited · College of American Pathologists
1303 Mable Avenue, Modesto, CA 95355
CMS-certified lab Accredited · Joint Commission
Attn Tracy Mangunlay- Laboratory, Modesto, CA 95356
CMS-certified lab Accredited · College of American Pathologists
1700 Coffee Road, Modesto, CA 95355
CMS-certified lab Accredited · Joint Commission
1700 Coffee Road, Modesto, CA 95355
CMS-certified lab Accredited · Joint Commission
Showing the nearest 5 CLIA-certified labs.
Source: CMS CLIA registry (Provider of Services), Q1 2026. Federal public records: active CLIA-certified laboratories near Modesto. 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, 947 primary-care, OB-GYN, infectious-disease and other clinicians have a CMS practice record within 30 miles of Modesto. They may be able to evaluate symptoms or order a confidential STD panel during a regular visit, and 289 offer telehealth.
Weizheng Jiang, MD Telehealth
Internal medicine · 1114 6th Street, Modesto
Manjit Dhillon, MD
Internal medicine · 730 17th Street, Modesto
Manjula Reddy, MD
Internal medicine · 730 17th Street, Modesto
Priti Modi, MD Telehealth
Internal medicine · 401 Paradise Road, Modesto
Abhilasha Sharma, MD
Family medicine · 209 Kerr Avenue, Modesto
Virgilio Ereso, MD
Internal medicine · 500 Coffee Road, Modesto
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 Modesto, CA 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.
GVHC Pharmacy
0.2 miRogers Drug Store
0.2 miNada Vicijan
0.2 miAmerican Pharmacy
0.8 miProgressive Pharmacy
0.8 mi
0.8 mi Showing the 6 closest pharmacies to Modesto, CA.
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 Modesto, 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
Visit from $39
Online STI treatment & DoxyPEP: same-day prescriptions 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
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 Stanislaus County, the county that includes Modesto, compare with California and U.S. averages, based on the most recent 2023 surveillance data. An estimated ~28% of residents are aged 15–34 (ACS), the age group with the highest reported chlamydia and gonorrhea rates nationally.
#22 of 58 California counties for chlamydia, a higher rate than 62% of the state
| Infection | Stanislaus County | California | United States |
|---|---|---|---|
| Chlamydia | 399.3 2,202 cases ▼ 19% | 491.1 | 492.2 |
| Gonorrhea | 106.6 588 cases ▼ 44% | 190.2 | 179.5 |
| Syphilis (P&S) | 24.5 135 cases ▲ 50% | 16.3 | 15.8 |
| Syphilis (early) | 15.1 83 cases ▼ 21% | 19.1 | 16 |
| Syphilis (late/unknown) | 47.2 260 cases ▲ 1% | 46.7 | 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 Stanislaus County, chlamydia has fallen from 461.4 to 399.3 per 100,000 (13%), gonorrhea has fallen from 229.5 to 106.6 per 100,000 (54%), and P&S syphilis has fallen from 26.9 to 24.5 per 100,000 (9%).
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 Stanislaus County.
Local HIV snapshot
Stanislaus County HIV care continuum (2023)
Stanislaus County recorded 12.2 new HIV diagnoses per 100,000 (2023), against 14.9 statewide and 13.7 nationally. Among Stanislaus County residents living with HIV, 77.9% are in care · 70.8% 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 Stanislaus County tests for syphilis.
Source: CDC NCHHSTP AtlasPlus, 2023 (county-level congenital syphilis is not published).
Local resources & officials
Data & references
Local context
McHenry Museum anchors one of Modesto's older stretches, but the city's economic texture runs closer to the households clustered out toward Shackelford and Bystrom, where typical rents leave little room once groceries and utilities are settled. With just over a quarter of households clearing six figures and unemployment running notably high by California standards, a meaningful share of working-age residents are navigating care costs carefully. That calculus matters for STI screening, where out-of-pocket fees or inconvenient hours can quietly become the reason an appointment never gets made. Modesto's households skew large, averaging well above three people, and nearly half of adults are married, which means sexual health conversations here often involve partners and shared decisions rather than individual ones alone.
The city's sizable share of young adults, people in their late teens and twenties still building careers and relationships, overlaps directly with the years when STI transmission runs highest and when stable income is least likely to cover unexpected medical visits. The options listed on this page vary in cost and hours, which matters when labor-force participation is lower than state norms and schedules are irregular. For residents near CA 99 or CA 132, reaching a listed clinic is often a straightforward drive, and several options on this page include sliding-scale or no-cost appointments that remove the financial barrier before it becomes a reason to wait.
Getting there
At 10.17/20 on the EPA walkability index, day-to-day errands in Modesto 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.
Modesto sits in Stanislaus County. Local context that shapes where residents test:
Local landmarks
Neighborhoods & communities
Major routes
Nearby cities & towns
Just outside Modesto? 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 Stanislaus County: the CDC's screening guidelines, each infection's detection window, per-test reference prices, and your privacy rights under California 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 Modesto-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 Modesto 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 California 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 California, a minor aged 12 or older can consent to confidential STI testing and treatment on their own, no parental permission is required.
California 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 CaliforniaSource: 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.
The closest is Quest Diagnostics (0.1 mi); 11 options are within 30 miles.
Most plans cover STD screening; a clinic or lab can bill insurance, or you can pay a flat self-pay price.
Yes, Golden Valley Health Centers (0.8 mi) offers free testing, and public clinics serve the uninsured.
Local options test for Chlamydia, Gonorrhea, Syphilis, Herpes, Hepatitis A, Hepatitis B, Hepatitis C, Rapid HIV, a full panel covers the common ones.
About 399 cases per 100,000 residents (2023), below the California average.
Lab results typically come back in 1–2 days.
PrEP (HIV-prevention medicine for HIV-negative people) is available locally, any provider can prescribe it.
In California, people under 18 can consent to confidential STD testing and treatment on their own.
Medical records are protected under federal HIPAA law, ask the clinic how it handles your information.
Yes, rectal symptoms can come from chlamydia or gonorrhea; ask for a rectal swab if you had anal exposure.
Have a different question? Browse the full STD & STI FAQ library, every question we answer, in one place.