New HIV diagnoses in King County run about 34% lower than the US average. Whether you have symptoms or want peace of mind in Mercer Island, Washington, you can choose from public clinics, private labs, or at-home kits. Consider whether you prefer lower costs, faster results, or the convenience of avoiding a clinic visit.
Available testing centers
12 testing options are listed for Mercer Island, WA. The nearest, Neighborcare Health, is about 2.5 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.
Neighborcare Health in Seattle runs appointments for gonorrhea, chlamydia, syphilis, herpes, and HIV testing, with same-visit treatment for bacterial infections confirmed on-site. Fees follow a sliding scale open to all, with Medicaid, Medicare, and commercial insurance also accepted.
Neighborcare Health maintains Spanish-speaking staff and coordinates interpretation services for additional languages directly within the clinic, meaning clinical conversations (symptoms, treatment plans, follow-up instructions) happen through personnel integrated into the care team rather than patched in from outside.
Substance-use treatment at Neighborcare Health is a discrete clinical service, not a referral destination: meaning a patient managing both a substance-use condition and an STI diagnosis works with the same facility on both, keeping medication adherence counseling and treatment coordination inside one record.
Neighborcare Health's panel includes herpes alongside gonorrhea, chlamydia, syphilis, and HIV: a specificity that matters because herpes screening requires a distinct test, and having it available at the same appointment eliminates a separate referral for what is one of the most common STIs.
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 + HRSA
Acrs, serving Seattle under federally qualified health center standing, ties STI screening costs to each patient's income through a structured sliding-scale schedule. Walk-ins are welcome, no appointment needed. Syphilis, gonorrhea, and chlamydia testing is available to anyone regardless of ability to pay the full rate.
Tests offered
Fees & payment
International Community Health Services in Seattle tests for HIV, syphilis, gonorrhea, chlamydia, herpes, and hepatitis A, B, and C on a sliding-scale fee open to everyone; appointments are required, and bacterial STIs can be treated the same visit.
Many clinics rely on ad-hoc solutions when a patient doesn't speak English, but International Community Health Services employs staff who speak Chinese, Spanish, Tagalog, and Vietnamese, with interpretation available for additional languages, so clinical conversations happen in full, not in fragments.
The prevention medicine program at International Community Health Services prescribes and monitors PrEP for ongoing HIV prevention, PEP for post-exposure HIV management, and DoxyPEP to reduce bacterial STI risk after potential exposure: each requiring its own dosing schedule, follow-up labs, and provider relationship that the clinic sustains over time.
International Community Health Services carries hepatitis C treatment on-site: meaning the provider who orders the antibody test is the same one who manages the antiviral course, a continuous relationship that matters especially for people without a regular specialist or navigating care on a sliding-scale budget.
Languages
Chinese, English, Interpretation Services Available for Non-English Languages, Spanish, Tagalog, Vietnamese
Tests offered
Serves
Care services
Prevention services
Fees & payment
Listing verified Oct 2025 · Source: CDC NPIN
University of Washington Medicine in Bellevue accepts Medicaid and private insurance, with fees scaled to those without coverage, and runs a full panel (rapid and conventional HIV, syphilis, gonorrhea, chlamydia, herpes, hepatitis A, B, and C, and TB) by appointment, with care available in Chinese.
University of Washington Medicine in Bellevue delivers STI care directly in Chinese, not through an intermediary service but as a standing clinical capability. For someone navigating a PrEP regimen, a hepatitis B diagnosis, or medication adherence counseling, conducting that conversation in Chinese means nothing gets simplified away.
PrEP, whether tenofovir-based Truvada or Descovy, requires the HIV testing, kidney-function monitoring, and prescription renewals that keep it working; University of Washington Medicine in Bellevue handles all of that directly. PEP, the post-exposure course, is likewise prescribed on-site, meaning both ends of HIV prevention live in the same chart.
When hepatitis C treatment requires a separate specialist referral, weeks pass between a positive antibody result and the antiviral prescription that actually clears the infection, and some patients never close that gap. University of Washington Medicine in Bellevue treats hepatitis C on-site, so the confirmed diagnosis moves directly into a treatment plan rather than a handoff.
Languages
Chinese, English
Tests offered
Serves
Care services
Prevention services
Fees & payment
Listing verified Dec 2025 · Source: CDC NPIN
Ryther South Seattle Youth Center, in Seattle, draws its sliding-scale STI screening from federally qualified health center standing. Meaning fees adjust to income for anyone who walks in. No appointment is needed to access syphilis, gonorrhea, and chlamydia testing at a cost tied to what you actually earn.
Tests offered
Fees & payment
ZoomCare in Bellevue pairs same-visit treatment for bacterial STIs (gonorrhea, chlamydia, syphilis) with testing across a wider panel that includes herpes, hepatitis A, B, and C, and TB. Fees run on a sliding scale, and insurance is accepted.
ZoomCare runs bloodwork and swabs for herpes simplex and all three hepatitis strains alongside the standard bacterial panel, meaning a single appointment produces results across infections. That coverage is built into the same clinical workflow, not scheduled as a separate visit.
Prevention prescribing at most urgent-care style clinics tops out at PrEP, leaving DoxyPEP, the post-exposure doxycycline protocol for bacterial STIs, off the table entirely. ZoomCare in Bellevue writes all three: PrEP for ongoing HIV prevention, PEP when indicated, and DoxyPEP for bacterial exposure reduction.
Interpretation services for non-English languages are available at ZoomCare, which means the conversation between patient and clinician (exposure history, medication instructions, follow-up timing) happens in full rather than in summary. That continuity keeps clinical decisions grounded in accurate information from the start.
Languages
English, Interpretation Services Available for Non-English Languages
Tests offered
Serves
Care services
Prevention services
Fees & payment
Listing verified Apr 2026 · Source: CDC NPIN
Harborview Primary Care at Hobson Place Clinic, in Seattle, ties its STI screening fees directly to income. Federal health center rules require it, so no one is turned away for inability to pay. Walk-ins are welcome for syphilis, gonorrhea, and chlamydia screening on a sliding-scale basis.
Tests offered
Fees & payment
Overlake Medical Clinics in Bellevue charges a standard fee for STI care, accepts insurance, and tests for HIV, gonorrhea, chlamydia, and syphilis: with HPV, hepatitis A, and hepatitis B vaccines available and appointments required to be seen.
Languages
English
Tests offered
Care services
Prevention services
Fees & payment
Listing verified Aug 2025 · Source: CDC NPIN
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 3 miles away; if you'd rather skip the trip, an at-home kit ships to Mercer Island, 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 for simplicity & support
$89 & 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 King 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.
7707 Southeast 27th St Suite 104, Mercer Island, WA 98040
CMS-certified lab
747 Broadway Floor B, Seattle, WA 98122
CMS-certified lab Accredited · College of American Pathologists
4915 25th Avenue Northeast Suite 204, Seattle, WA 98105
CMS-certified lab
Source: CMS CLIA registry (Provider of Services), Q1 2026. Federal public records: active CLIA-certified laboratories near Mercer Island. 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, 3,333 primary-care, OB-GYN, infectious-disease and other clinicians have a CMS practice record within 30 miles of Mercer Island. They may be able to evaluate symptoms or order a confidential STD panel during a regular visit, and 1,389 offer telehealth.
Paul Sytman, MD Telehealth
Internal medicine · 3236 78th Avenue Southeast, Mercer Island
Lester Sauvage, MD
Internal medicine · 9725 Southeast 36th Street, Mercer Island
Amy Wilkerson, MD
Family medicine · 5316 Rainier Avenue South, Seattle
Khamphoucanh Southisombath, MD Telehealth
Family medicine · 4400 37th Avenue South, Seattle
Dang Do, MD
Family medicine · 3828 South Graham Street, Seattle
Thuy Do, MD
Family medicine · 3828 South Graham Street, Seattle
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 Mercer Island, WA 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.
1.4 mi 
1.4 mi Longs Drug Store
1.7 miQFC Pharmacy
1.8 miRainier Park Columbia Pharmacy
2.5 miShowing the 5 closest pharmacies to Mercer Island, WA.
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 Mercer Island, 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
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
$0 with most insurance
Free online PrEP & DoxyPEP: HIV prevention, home lab kits, no in-person visit
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 King County, the county that includes Mercer Island, compare with Washington and U.S. averages, based on the most recent 2023 surveillance data. An estimated ~19% of residents are aged 15–34 (ACS), the age group with the highest reported chlamydia and gonorrhea rates nationally.
#18 of 39 Washington counties for chlamydia, a higher rate than 54% of the state
| Infection | King County | Washington | United States |
|---|---|---|---|
| Chlamydia | 324 7,360 cases ▼ 9% | 354.4 | 492.2 |
| Gonorrhea | 198.5 4,509 cases ▲ 53% | 129.6 | 179.5 |
| Syphilis (P&S) | 25.4 578 cases ▲ 19% | 21.3 | 15.8 |
| Syphilis (early) | 18 409 cases ▲ 44% | 12.5 | 16 |
| Syphilis (late/unknown) | 29.1 660 cases ▲ 27% | 22.9 | 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 King County, chlamydia has fallen from 373.4 to 324 per 100,000 (13%), gonorrhea has risen from 192 to 198.5 per 100,000 (3%), and P&S syphilis has risen from 14.8 to 25.4 per 100,000 (72%).
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 King County.
Local HIV snapshot
Federal priority area: King County is one of 48 U.S. counties prioritized under the Ending the HIV Epidemic initiative: targeted federal funding to expand local HIV testing, PrEP, and prevention.
King County HIV care continuum (2023)
King County recorded 9 new HIV diagnoses per 100,000 (2023), against 6.3 statewide and 13.7 nationally. Among King County residents living with HIV, 88% know their status · 87% are in care · 79.1% 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 King County tests for syphilis.
Source: CDC NCHHSTP AtlasPlus, 2023 (county-level congenital syphilis is not published).
Local resources & officials
Data & references
Local context
The I-90 bridges, the Lacey V. Murrow and Homer M. Hadley spans threading across Lake Washington, put Seattle-side clinics within a 15-to-20-minute drive for most Mercer Island residents, which is genuinely useful context when you're weighing whether to book an appointment on a weekday. That said, roughly a third of households here rent at prices that leave little cushion, and even among the island's largely high-earning population, an unplanned out-of-pocket testing cost can quietly reshape the decision. The options listed on this page span a range of fee structures precisely because cost pressure doesn't sort neatly by zip code.
The island's household profile (predominantly married couples, families averaging close to three people) can create a false impression that STI screening is someone else's concern. But neighborhoods like Mercer Heights and Beaumont include younger adults in their late teens and twenties, the years when new partnerships are most common and when a straightforward path to testing matters most. A two-thirds labor-force participation rate means a meaningful share of residents aren't working standard hours, yet that still leaves many people whose schedules compress every errand into a narrow window. Something worth checking before you assume the nearest option on the map is also the most convenient one to actually reach.
Getting there
Mercer Island scores 11.16/20 on the EPA walkability index, so many trips are walkable or a short ride, though a car still gives you the widest choice of testing centers.
Source: EPA National Walkability Index 2021.
ZIP 98040 snapshot
ZIP-level Census figures for the wider 98040 area around Mercer Island: a single ZIP can span several communities, so they describe the area, not Mercer Island alone.
Mercer Island sits in King County, ZIP 98040. Local context that shapes where residents test:
Local landmarks
Neighborhoods & communities
Major routes
Nearby cities & towns
Just outside Mercer Island? 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 King County: the CDC's screening guidelines, each infection's detection window, per-test reference prices, and your privacy rights under Washington 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 Mercer Island-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 Mercer Island 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 Washington 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 Washington, a minor of any age can consent to confidential STI testing and treatment on their own, no parental permission is required.
Washington 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 WashingtonSource: 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.
Possibly, Bellevue, WA is close; compare it by distance against Neighborcare Health.
Public clinics are free; private labs ~$24–$139, at-home kits $49+.
Yes, community and public clinics test the uninsured, with sliding-scale fees.
Local options test for Chlamydia, Gonorrhea, Syphilis, Herpes, Hepatitis A, Hepatitis B, Hepatitis C, Rapid HIV, a full panel covers the common ones.
About 324 cases per 100,000 residents (2023), below the Washington average.
In Washington, people under 18 can consent to confidential STD testing and treatment on their own.
PrEP (HIV-prevention medicine for HIV-negative people) is available locally, any provider can prescribe it.
Expedited partner therapy lets a provider treat a partner without an exam, where state law allows.
Just note your exposure dates and symptoms; for urine tests, hold off urinating ~1 hour before.
A clinic offers same-day answers and on-site treatment; an at-home kit trades that for privacy and convenience, both use real lab testing.
Have a different question? Browse the full STD & STI FAQ library, every question we answer, in one place.