In Grayson County, reported gonorrhea runs about 59% lower than the national average. If you test regularly or had a recent risk, in Knollwood, Texas, you can choose between walk-in clinics for same-day testing, or labs and at-home kits for more flexibility. See your options below.
Available testing centers
7 testing options are listed for Knollwood, TX. The nearest, Quest Diagnostics, 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.
Callie Clinic in Sherman covers rapid HIV, hepatitis C, syphilis, gonorrhea, and chlamydia testing with same-visit treatment for bacterial infections; fees run on a sliding scale open to all, with Medicaid and insurance accepted. Appointments are required. Ryan White funding anchors its HIV care from first test through long-term treatment.
Testing positive at a clinic that handles only diagnostics leaves patients to navigate HIV care on their own, finding a provider, establishing care, managing medications across separate systems. Callie Clinic, backed by Ryan White funding, carries a patient from initial test through ongoing HIV medical treatment and medication adherence counseling within the same practice.
When PrEP or PEP requires a separate prescribing relationship, the gap between need and medication is measured in days or dropped follow-through. Callie Clinic holds that prescription capacity directly: uninsured patients can access PrEP at reduced cost, and PEP is available on-site so prevention doesn't depend on finding a second provider.
Callie Clinic provides hepatitis C treatment on-site, which means a reactive rapid hep C test doesn't send someone out the door in search of a specialist. The path from diagnosis to a treatment plan runs through the same location.
Languages
English
Tests offered
Serves
Care services
Prevention services
Fees & payment
Listing verified Apr 2026 · Source: CDC NPIN
Grayson County Health Department in Sherman runs its full STI panel (HIV, syphilis, gonorrhea, chlamydia, and herpes) at no cost to patients, with insurance, Medicaid, and Medicare accepted and a sliding scale applied; appointments are required, and confirmed bacterial infections are treated the same visit.
Plenty of clinics post a sliding scale and still hand back a bill. At Grayson County Health Department, the fee structure closes at zero (testing, treatment, vaccines, counseling) all of it, regardless of what insurance you carry or whether you carry any at all.
When a clinic can't provide care in Spanish directly, the gap shows up in follow-through: questions go unasked, instructions get fuzzy, and treatment stalls. Grayson County Health Department delivers STI care, counseling, and prevention education in Spanish, keeping the conversation complete from the first question to the last instruction.
Leaving herpes off the standard panel means a separate appointment, a separate cost, and a gap in the picture. Grayson County Health Department tests for herpes alongside HIV, syphilis, gonorrhea, and chlamydia. One visit covers what a narrower panel would leave open.
Languages
English, Spanish
Tests offered
Serves
Care services
Prevention services
Fees & payment
Listing verified May 2026 · Source: CDC NPIN
True Options Pregnancy Center in Sherman tests for gonorrhea and chlamydia at no charge, donations accepted but never required, with treatment available on-site and an appointment needed to get started.
Languages
English
Tests offered
Care services
Prevention services
Fees & payment
Listing verified Jun 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 Knollwood, 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 for simplicity & support
$89 & 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 Grayson 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.
500 North Highland Avenue, Sherman, TX 75092
CMS-certified lab Accredited · College of American Pathologists
204 Medical Drive Suite 150, Sherman, TX 75092
CMS-certified lab
1810 US Hwy 82W, Suite 100, Sherman, TX 75092
CMS-certified lab Accredited · COLA
1906 West US Highway 82 Suite 100, Sherman, TX 75092
CMS-certified lab Accredited · COLA
115 West Travis Street, Sherman, TX 75092
CMS-certified lab Accredited · COLA
Showing the nearest 5 CLIA-certified labs.
Source: CMS CLIA registry (Provider of Services), Q1 2026. Federal public records: active CLIA-certified laboratories near Knollwood. 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, 200 primary-care, OB-GYN, infectious-disease and other clinicians have a CMS practice record within 30 miles of Knollwood. They may be able to evaluate symptoms or order a confidential STD panel during a regular visit, and 39 offer telehealth.
Srilatha Srinivasan, MD
Family medicine · 4028 North US Hwy 75, Sherman
Ashley Brumm, MD
OB-GYN · 3601 North Calais Street, Sherman
Benjamin Tomelleri-Galichia, MD
Family medicine · 809 Gallagher Drive, Sherman
Shahbaz Ahmad, MD
Internal medicine · 1111 Gallagher Drive, Sherman
Aditi Swami, MD
Infectious disease · 2600 North US Hwy 75, Sherman
Paul Millmann, MD Telehealth
Family medicine · 1700 Gallagher Drive, Sherman
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 Knollwood, TX 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.
Sams Pharmacy
1.2 miCarerx Pharmacy at Sherman
1.3 miHeritage Parkway Pharmacy
1.7 miGenoa Healthcare
1.9 miTexoma Pharmacy
1.9 miShowing the 5 closest pharmacies to Knollwood, TX.
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 Knollwood, 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
From $0 insured
Telehealth PrEP & DoxyPEP with at-home testing and ongoing monitoring
$0 with most insurance
Free online PrEP & DoxyPEP: HIV prevention, home lab kits, no in-person visit
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 Grayson County, the county that includes Knollwood, compare with Texas and U.S. averages, based on the most recent 2023 surveillance data. An estimated ~42% of residents are aged 15–34 (ACS), the age group with the highest reported chlamydia and gonorrhea rates nationally.
#129 of 254 Texas counties for chlamydia, a higher rate than 49% of the state
| Infection | Grayson County | Texas | United States |
|---|---|---|---|
| Chlamydia | 295.4 434 cases ▼ 40% | 491.9 | 492.2 |
| Gonorrhea | 73.5 108 cases ▼ 58% | 176.4 | 179.5 |
| Syphilis (P&S) | 8.8 13 cases ▼ 41% | 15 | 15.8 |
| Syphilis (early) | 21.1 31 cases ▼ 20% | 26.4 | 16 |
| Syphilis (late/unknown) | 20.4 30 cases ▼ 54% | 44.3 | 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 Grayson County, chlamydia has fallen from 306.2 to 295.4 per 100,000 (4%), gonorrhea has fallen from 169 to 73.5 per 100,000 (57%), and P&S syphilis has risen from 0.7 to 8.8 per 100,000 (1157%).
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 Grayson County.
Local HIV snapshot
Grayson County HIV care continuum (2023)
Grayson County recorded 6.6 new HIV diagnoses per 100,000 (2023), against 20.2 statewide and 13.7 nationally. Among Grayson County residents living with HIV, 87.5% are in care · 76.9% 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 Grayson County tests for syphilis.
Source: CDC NCHHSTP AtlasPlus, 2023 (county-level congenital syphilis is not published).
Local resources & officials
Data & references
Local context
Knollwood's economy has long centered on small manufacturing, retail, and family businesses where steady work and benefits matter. The kind of employment that often includes health coverage and periodic wellness checks. For residents in their late teens through thirties, routine STI screening fits naturally into that framework: confidential testing keeps pace with life changes, new relationships, and the practical need to know one's status before sharing it with a partner. Testing in and around Knollwood is available through providers listed on this page, and the process remains entirely private regardless of where you live in town or which clinic you choose.
The logistics here are straightforward. Knollwood sits in Grayson County with access to services in nearby Sherman and along the main routes that connect the area. Clinics understand that discretion matters: your test results don't appear in workplace records, don't trigger notifications to anyone else, and don't follow you into other parts of your life. The goal is simple: making it easy to know your status so you can move forward with confidence.
Young adults in Knollwood often balance work, relationships, and personal goals without the luxury of overthinking health decisions. STI screening removes one source of uncertainty. Whether you're establishing care in a new place, following up after a possible exposure, or staying current as part of routine health maintenance, testing is available quickly and without judgment.
Getting there
At 6.82/20 on the EPA walkability index, day-to-day errands in Knollwood 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 75092 snapshot
ZIP-level Census figures for the wider 75092 area around Knollwood: a single ZIP can span several communities, so they describe the area, not Knollwood alone.
Knollwood sits in Grayson County, ZIP 75092. Local context that shapes where residents test:
Local landmarks
Neighborhoods & communities
Major routes
Nearby cities & towns
Just outside Knollwood? 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 Grayson County: the CDC's screening guidelines, each infection's detection window, per-test reference prices, and your privacy rights under Texas 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 Knollwood-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 Knollwood 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 Texas 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 Texas, a minor of any age can consent to confidential STI testing and treatment on their own, no parental permission is required.
Texas 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 TexasSource: 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 (1.1 mi); 7 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, 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 295 cases per 100,000 residents (2023), below the Texas average.
In Texas, 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.
Medical records are protected under federal HIPAA law, ask the clinic how it handles your information.
It means an infection was found; a provider confirms it and starts treatment, most STIs are curable or manageable.
A full panel typically covers chlamydia, gonorrhea, syphilis, HIV, and hepatitis B and C.
Have a different question? Browse the full STD & STI FAQ library, every question we answer, in one place.