STD Testing in San Marcos, TX
8 places to get tested — 2 partner labs that need no appointment, and 6 clinics and testing sites near San Marcos.
- 2partner labs
- 1free clinic
- 4sliding scale
- 1insurance or fee
Order a test online
Pick a panel, visit a lab nearby, results in 1–2 days. No appointment, no insurance.
GET TESTED NOWCompare pricing →4,500+ labs nationwide · from $24Partner labs near San Marcos
Order online, then walk in the same day with no appointment. A urine or blood sample takes about 15 minutes, and results come back in 1–2 days. They are confidential: never reported to your insurance company or added to your medical record.
Quest Diagnostics
1.6 mi awayNo appointmentOpen Saturday$10 off orders over $100 applied at checkoutOrder a test for this lab →Clinical Pathology Labs
2.1 mi awayNo appointmentOpen Saturday$10 off orders over $100 applied at checkoutOrder a test for this lab →
We earn a commission if you order through the links above. It does not change what you pay, and it does not decide which labs are listed — those are the closest partner labs to San Marcos.
Explore testing locations in and near San Marcos
Clinics and testing sites near San Marcos
No free or low-cost clinic is addressed in San Marcos itself, so the nearest are listed below, closest first. Public clinics generally take longer to return results than a private lab, and several test on set days only, so it is worth calling ahead. If you would rather not wait or give your details at a public clinic, the 2 partner labs in San Marcos need no appointment and return results in 1–2 days.
How we chose these 6 clinics
- Every one is on the CDC’s GetTested locatorThe wider CDC directory we draw from has over 16,000 entries. Only the ones GetTested also lists can appear here, and all 6 clinics below do.
- Listings that name fewer than three tests are left outEven on GetTested, 527 listings name fewer than three tests. We don’t show them anywhere.
- Unverified pregnancy centers are never shownThe CDC lists some pregnancy centers whose STD testing we couldn’t verify. We don’t list them anywhere.
- Cost is stated the way the CDC lists itFree, sliding scale or insurance accepted, as each clinic reports it to the CDC. We don’t estimate prices, and if the listing says nothing, the card says “Fees not listed.”
Directory retrieved September 4, 2026. Open “View services” on any card to see when that clinic last updated its listing. All sources
- Clinic11.4 mi away
Carbon Health
Dry River District Clinic
19220 S I-35 Frontage Rd, Kyle, TX, 78640
HoursMon-Sun 9:00am-7:00pm
AppointmentsWalk-ins acceptedFeesInsurance accepted- HIV & STI testing
- PrEP & PEP
- Treats STIs
- Interpretation listed
CallWebsiteDirectionsView services
Tests Chlamydia · Gonorrhea · Syphilis · HIV · Hepatitis C · Hepatitis A · TB
Treatments STI treatment · PrEP · PEP
Languages English · interpreter available
CDC GetTested listing, last updated by the source July 7, 2025. Directory retrieved September 4, 2026.
- Clinic21.9 mi away
Texas Department of State Health Services
Public Health Region 8
312 S Saunders St, Seguin, TX, 78155
HoursMon-Fri 8:00am-5:00pm
AppointmentsAppointment requiredFeesFree STI testing listed- HIV & STI testing
- Treats STIs
CallWebsiteDirectionsView services
Tests Chlamydia · Gonorrhea · Syphilis · HIV
Treatments STI treatment · Family planning · HPV vaccine · Hep B vaccine · Case management
Languages English
CDC GetTested listing, last updated by the source April 29, 2026. Directory retrieved September 4, 2026.
Buy an at-home STD test near San Marcos and online
CVS Pharmacy, Target, Walgreens and Walmart sell over-the-counter test kits near San Marcos, and myLAB Box ships one to your door. You collect the sample at home and mail it to a lab. Stock varies by branch — call ahead or check online before making the trip.
CVS Pharmacy
Nearest branch · 1.3 mi3 storesTarget
Nearest branch · 0.2 mi2 storesWalgreens
Nearest branch · 0.9 mi2 storesWalmart
Nearest branch · 1.7 mi1 storemyLAB Box
Online · ships nationwideMail-in kit
We earn a commission if you order a myLAB Box kit through the link above. It does not change what you pay, and it does not decide which pharmacies are listed — those are the chains with branches near San Marcos.
Hays County STD rates
Reported cases per 100,000 residents. Change shown against the year before.
Chlamydia
▼ 4.9%472.4per 100k
1,325 reported cases · 2023 · 4% below the TX rate
Gonorrhea
▲ 0.8%159.4per 100k
447 reported cases · 2023 · 10% below the TX rate
Syphilis
▼ 28.4%14.6per 100k
41 reported cases · 2023 · 3% below the TX rate
HIV
▲ 36.4%30new diagnoses
2023 · rate not published
Source: CDC NCHHSTP AtlasPlus, 2023 release · Hays County TX STD Statistics
There were 30 new HIV diagnoses in Hays County in 2023. HIV is the one infection where how soon you test changes which test you need — an RNA test detects it far earlier than a standard antibody test.
Hays County reported 1,325 chlamydia cases in 2023, a rate of 472.4 per 100,000 residents. Most people who have chlamydia or gonorrhea have no symptoms at all, so waiting for something to feel wrong is not a strategy.
HIV prevention & treatment
PrEP, DoxyPEP & Online Treatment
A test result is the start, not the end. If you are negative and want to stay that way, PrEP and DoxyPEP cut the risk of a future infection. If you are positive, most STIs can be treated without setting foot in a clinic. Both are available to people in San Marcos by video visit, prescribed by clinicians licensed in Texas.
- Treatment & DoxyPEP
Wisp
STI treatment $39 · DoxyPEP from $22
Treatment for an STI, and DoxyPEP, prescribed online. The prescription goes to your pharmacy the same day.
Visit Wisp - HIV PrEP & DoxyPEP
Q Care Plus
$0 for most insured patients
PrEP and DoxyPEP by video visit, with test kits posted to you and follow-up bloodwork tracked between refills.
Visit Q Care Plus - HIV PrEP & DoxyPEP
MISTR
$0 with or without insurance
HIV prevention handled entirely from home: PrEP and the lab work that goes with it, no appointment.
Visit MISTR
Prices depend on your insurance and change frequently — check the provider’s own site before ordering. None of these replace emergency care.
STD testing in San Marcos, answered
Where can I find free or sliding-scale STD testing near San Marcos?
Among the 6 clinics listed near San Marcos, 1 lists free testing for at least one infection and 4 list sliding-scale fees. Confirm eligibility and charges before visiting. Free testing is listed at Texas Department of State Health Services.
How much does STD testing cost near San Marcos?
Among the 6 clinics listed near San Marcos, 1 list free testing for at least one infection and 4 charge on a sliding scale based on income. Private lab testing is a flat price paid up front — no insurance is filed, so nothing appears on an explanation of benefits.
Can I get tested on a weekend near San Marcos?
1 of the 6 listed clinics publish Saturday hours: Carbon Health. Some partner labs also open on Saturday — the cards above show which.
How common are STDs in San Marcos?
In 2023, Hays County reported 1,325 chlamydia cases — a rate of 472.4 per 100,000 residents. Gonorrhea was 159.4 per 100,000. There were also 30 new HIV diagnoses in 2023.
Is testing available in Spanish near San Marcos?
4 of the 6 listed clinics indicate that Spanish-language services are available, and 1 list PrEP.
- Partner labs
- Quest and Labcorp location directories · checked August 2026
- Public clinics
- CDC GetTested / NPIN directory · retrieved September 4, 2026
- Retailers
- Retailer store directories · updated September 2026
- Statistics
- CDC NCHHSTP AtlasPlus · reporting year 2023
- HIV diagnoses
- CDC HIV Surveillance · reporting year 2023
