Syphilis cases in St. Charles County are 66% lower than the US average. If you need testing after exposure or for routine care in Weldon Spring, Missouri, weigh whether you want to use an insurance-billing clinic with sliding-scale fees or a private lab with flat self-pay pricing. We list some options below.
Available testing centers
9 testing options are listed for Weldon Spring, MO. The nearest, Compass Health, is about 1.3 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.
Compass Health in Weldon Spring welcomes walk-ins without an appointment, letting patients act on STI concerns the same day. Federally qualified standing anchors its sliding-scale fees to income, and a single visit can cover syphilis, gonorrhea, and chlamydia screening.
Tests offered
Fees & payment
Mercy-GoHealth Urgent Care in St Peters charges fees on a sliding scale tied to income, so cost doesn't determine who gets screened. Walk-in STI testing covers the core panel (syphilis, gonorrhea, and chlamydia) without an appointment needed.
Languages
English, Interpretation Services Available for Non-English Languages
Tests offered
Serves
Fees & payment
Listing verified Dec 2025 · Source: CDC NPIN
Total Access Urgent Care in O'Fallon runs gonorrhea, chlamydia, syphilis, herpes, hepatitis B, and rapid HIV testing alongside same-visit treatment for bacterial infections: no appointment needed, with Medicaid, Medicare, and private insurance all accepted alongside a standard fee structure.
Total Access Urgent Care tests for herpes and hepatitis B in addition to the core bacterial STIs and HIV, a meaningful capability for anyone without a regular primary care provider who needs a single visit to cover exposures that most urgent-care panels don't capture. Hepatitis A and B vaccines are available on the same visit.
Languages
English
Tests offered
Care services
Prevention services
Fees & payment
Listing verified Apr 2026 · Source: CDC NPIN
Mercy in Chesterfield runs by appointment, so scheduling locks in time with a provider who can test for HIV, syphilis, gonorrhea, chlamydia, herpes, hepatitis A, B, and C, and TB, and treat bacterial infections the same visit, on a sliding-scale fee accepted alongside Medicaid, Medicare, and most insurance.
Leaving herpes or hepatitis A, B, or C undetected means carrying forward a diagnosis that a four-infection panel simply never surfaces. Mercy tests all three hepatitis strains alongside herpes in the same appointment, closing a gap that would otherwise require a separate lab order and an extra wait for results.
Mercy prescribes DoxyPEP, doxycycline taken after a potential bacterial STI exposure, directly at the clinic. Having that prescription written by the same provider who handles testing means the drug and the monitoring conversation happen in one coordinated appointment rather than across separate systems.
Languages
English
Tests offered
Care services
Prevention services
Fees & payment
Listing verified Dec 2025 · Source: CDC NPIN
Planned Parenthood Great Rivers in Saint Peters tests for HIV, syphilis, gonorrhea, chlamydia, herpes, and hepatitis B and C on a sliding-scale fee with insurance and Medicaid accepted; bacterial infections are treated the same visit, and appointments are required.
Many clinics handle non-English speakers with a callback or an offsite arrangement that delays the actual appointment. At Planned Parenthood Great Rivers in Saint Peters, Spanish-language care and interpretation services for other languages are built into the visit itself, so nothing about your care gets deferred while language gets sorted out.
Without a Title X provider, a minor seeking STI testing alongside family planning faces a second appointment at a separate clinic, or goes without. Planned Parenthood Great Rivers holds Title X designation, which means legally confidential family planning and STI services for minors are available here, not elsewhere down the road.
Planned Parenthood Great Rivers in Saint Peters prescribes both Truvada/Descovy-class PrEP and PEP directly: meaning the HIV testing, counseling, and prescription management that ongoing PrEP requires happen at the same clinic, keeping prevention continuous rather than parceled across separate providers.
Languages
English, Interpretation Services Available for Non-English Languages, Spanish
Tests offered
Serves
Care services
Prevention services
Fees & payment
Listing verified May 2026 · 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 1 mile away; if you'd rather skip the trip, an at-home kit ships to Weldon Spring, 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 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 St. Charles 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.
1475 Kisker Road Suite 100, Saint Charles, MO 63304
CMS-certified lab Accredited · Joint Commission
15 Research Park Drive, Saint Charles, MO 63304
CMS-certified lab
2000 Salt River Road, Saint Peters, MO 63376
CMS-certified lab
Source: CMS CLIA registry (Provider of Services), Q1 2026. Federal public records: active CLIA-certified laboratories near Weldon Spring. 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, 1,866 primary-care, OB-GYN, infectious-disease and other clinicians have a CMS practice record within 30 miles of Weldon Spring. They may be able to evaluate symptoms or order a confidential STD panel during a regular visit, and 531 offer telehealth.
Vanaja Yedla, MD
Internal medicine · 4801 Weldon Spring Parkway, Weldon Spring
Ashley Sims, DO
OB-GYN · 20 Progress Point Parkway, O Fallon
David Janssen, MD
Infectious disease · 20 Progress Point Parkway, O Fallon
Nicholas Moore, MD Telehealth
Family medicine · 1475 Kisker Road, Saint Charles
Ladonna Finch, MD
Family medicine · 1475 Kisker Road, Saint Charles
Sarah Davis
Internal medicine · 600 Breeze Park Drive, Weldon Spring
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 Weldon Spring, MO 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.
Centerpointe Pharmacy
1.2 mi
1.2 mi 
2.0 mi Mercy Pharmacy Services
2.2 miShowing the 4 closest pharmacies to Weldon Spring, MO.
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 Weldon Spring, 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 $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
Visit from $0 insured
Telehealth STI treatment and sexual-health care, delivered or 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 St. Charles County, the county that includes Weldon Spring, compare with Missouri and U.S. averages, based on the most recent 2023 surveillance data. An estimated ~12% of residents are aged 15–34 (ACS), the age group with the highest reported chlamydia and gonorrhea rates nationally.
#47 of 115 Missouri counties for chlamydia, a higher rate than 59% of the state
| Infection | St. Charles County | Missouri | United States |
|---|---|---|---|
| Chlamydia | 265.2 1,105 cases ▼ 47% | 498.6 | 492.2 |
| Gonorrhea | 67.4 281 cases ▼ 67% | 201.9 | 179.5 |
| Syphilis (P&S) | 5.3 22 cases ▼ 75% | 21.5 | 15.8 |
| Syphilis (early) | 3.4 14 cases ▼ 73% | 12.4 | 16 |
| Syphilis (late/unknown) | 7.2 30 cases ▼ 79% | 33.8 | 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 St. Charles County, chlamydia has risen from 258.4 to 265.2 per 100,000 (3%), gonorrhea has fallen from 85.4 to 67.4 per 100,000 (21%), and P&S syphilis has risen from 3.5 to 5.3 per 100,000 (51%).
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 St. Charles County.
Local HIV snapshot
Federal priority area: Missouri is one of the U.S. jurisdictions prioritized under the Ending the HIV Epidemic initiative: targeted federal funding to expand local HIV testing, PrEP, and prevention.
St. Charles County HIV care continuum (2023)
St. Charles County recorded 4.8 new HIV diagnoses per 100,000 (2023), against 10.6 statewide and 13.7 nationally. Among St. Charles County residents living with HIV, 81% are in care · 73% 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 St. Charles County tests for syphilis.
Source: CDC NCHHSTP AtlasPlus, 2023 (county-level congenital syphilis is not published).
Local resources & officials
Data & references
Local context
Avenue of the Saints cuts a quick path through Weldon Spring, and for most residents the drive to a clinic is measured in minutes rather than the longer hauls common in less-connected parts of St. Charles County. That accessibility matters, because the city's younger adults (people in their late teens and twenties still sorting out relationships, new jobs, and living arrangements) are precisely the group for whom routine STI screening is most consequential, and for whom a short, low-cost errand is far easier to follow through on than a half-day commitment. Weldon Spring skews heavily toward homeowners, with only a small share of households renting, and those who do rent face monthly costs that land well above what most people would call affordable for a starter apartment.
When a meaningful portion of take-home pay disappears into rent, discretionary health spending shrinks fast. The testing options listed here include providers that work with a wide range of financial situations, which levels the field for the renter households that feel that cost pressure most directly. The city's high rate of married households and above-average labor-force participation mean that many adults are managing dual schedules, school pickups, and packed evenings. Clinics accessible off Mid Rivers Mall Drive or South Saint Peters Parkway fit naturally into a post-work errand run past Legacy Park, which, for a lot of families here, is exactly when a screening appointment actually gets made.
Getting there
At 7.41/20 on the EPA walkability index, day-to-day errands in Weldon Spring 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 63304 snapshot
ZIP-level Census figures for the wider 63304 area around Weldon Spring: a single ZIP can span several communities, so they describe the area, not Weldon Spring alone.
Weldon Spring sits in St. Charles County, ZIP 63304. Local context that shapes where residents test:
Local landmarks
Neighborhoods & communities
Major routes
Nearby cities & towns
Just outside Weldon Spring? 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 St. Charles County: the CDC's screening guidelines, each infection's detection window, per-test reference prices, and your privacy rights under Missouri 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 Weldon Spring-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 Weldon Spring 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 Missouri 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 Missouri, a minor of any age can consent to confidential STI testing and treatment on their own, no parental permission is required.
Missouri 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 MissouriSource: 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, O'Fallon, MO is close; compare it by distance against Compass Health.
Public clinics are free; private labs ~$24–$139, at-home kits $49+.
Public clinics nearby offer free HIV testing.
Local options test for Chlamydia, Gonorrhea, Syphilis, Herpes, Hepatitis A, Hepatitis B, Hepatitis C, Rapid HIV, a full panel covers the common ones.
About 265 cases per 100,000 residents (2023), below the Missouri average.
PrEP (HIV-prevention medicine for HIV-negative people) is available locally, any provider can prescribe it.
In Missouri, people under 18 can consent to confidential STD testing and treatment on their own.
Lab results typically come back in 1–2 days.
Start treatment, tell recent partners so they can test, avoid sex until cleared, and retest if advised, most STIs resolve with care.
Resistance is rising, which is why the CDC advises a particular treatment; don't self-treat, get tested and treated correctly.
Have a different question? Browse the full STD & STI FAQ library, every question we answer, in one place.