This page is general health information, not medical advice. It cannot tell you whether you have an infection. A clinician can, and the testing options on this site are a good place to start.

Many people want an answer fast. Some Las Vegas clinics can give certain results during the same visit. Others send a sample to a lab, and the answer comes back in a few days.

This guide shows you how to plan a visit that gets you the quickest results available. It also explains which results can come the same day and which cannot, so you know what to expect before you walk in.

What "same-day" really means

Same-day testing is not one thing. It depends on the type of test.

Rapid tests read a result at the clinic, often within minutes to an hour. Rapid HIV tests are the most common example. Some clinics also offer rapid syphilis tests, but you should ask first.
Lab-based tests are sent out. Tests for chlamydia and gonorrhea are usually nucleic acid amplification tests (NAATs). The CDC STI Treatment Guidelines (2021) recommend NAATs for these infections. Results often take about 1 to 3 days, depending on the lab and the clinic.

So the honest answer to "how long do STD test results take" is: it varies. A rapid HIV test may be ready during your visit. A chlamydia or gonorrhea test usually is not. Ask the clinic at check-in when and how you will hear back.

Materials: what to bring and have ready

A little preparation makes a visit faster. Gather these before you go:

Photo ID. The Southern Nevada Health District (SNHD) asks you to bring photo ID and proof of income for its sliding-scale fees.
Proof of income and household size, if you want a sliding-scale fee. SNHD says charges are based on income and the number of people in your household.
Insurance card, if you have one. The Center in Las Vegas says it bills certain insurance.
A phone number you will answer. If a result is not ready during your visit, the clinic needs a way to reach you.
A short list of notes. Include any symptoms, the dates of recent exposures, and any medicines you take. A clinician uses these to pick the right tests.
Time. Plan for more than a quick stop, especially at a walk-in clinic.

Step-by-step: how to get same-day STD testing in Las Vegas

Step 1: Decide what you want tested

Start with the tests you are asking for. The CDC STI Treatment Guidelines (2021) and the USPSTF both describe who benefits from screening, and the right panel depends on your age, partners, body parts exposed and health history. A clinician can help you choose.

It helps to know which results can be fast:

HIV: Rapid tests can give a result at the visit. Clinics listed in the SNHD and The Center information offer rapid HIV testing.
Syphilis: Some places offer a rapid test and others use a blood sample sent to a lab. The local sources for this guide do not say which Las Vegas sites offer rapid syphilis tests, so ask the clinic directly.
Chlamydia and gonorrhea: These are usually lab-based. Plan on waiting for a call or message.

Step 2: Pick a Las Vegas clinic that fits your timing

The quickest way to use a same-day option is to choose a site that takes walk-ins. Here is what the local sources say. You can also see the full local testing list at our Las Vegas clinic list.

SNHD Sexual Health Clinic, Decatur site (280 S. Decatur Blvd., Las Vegas, NV 89107). SNHD says walk-ins for STI testing and treatment are available until capacity is reached. The site also offers free Express Testing for people without symptoms. SNHD lists Express Testing at this site Monday through Thursday, 7:30 AM to 12 PM and 1 PM to 3:30 PM. The phone number is (702) 759-1700. See the SNHD Sexual Health Clinic page.

SNHD Sexual Health Clinic, Fremont Public Health Center (2830 E. Fremont St., Las Vegas, NV 89104). SNHD lists free Express Testing here on Fridays, 7:30 AM to 4 PM. For clinic visits, SNHD asks you to arrive by 5:30 PM to allow time for processing. The phone number is (702) 759-1700.

Arlene Cooper Community Health Center at The Center (401 S. Maryland Parkway, Las Vegas, NV 89101). The Center says HIV testing is free and STI screening is low cost. It states that appointments are highly encouraged, and that walk-in services are available for a limited number of patients each day. Call 702-802-5432 for appointments. Visit The Center's health center page for details.

Nevada Health Centers lists STD testing at its Martin Luther King Family Health Center (1799 Mount Mariah Dr., Las Vegas, NV 89106; 702.383.1961) and its Nellis Family Medical Center (691 N. Nellis Blvd., Las Vegas, NV 89110; 702.563.4662). It offers a sliding-fee discount program based on family size and income. Walk-in availability is not stated in the sources for this guide, so call first. See Nevada Health Centers.

UNLV Student Health Center (4505 S. Maryland Pkwy.; 702-895-3370) lists STI and HIV testing for UNLV students. It is not a general-public clinic.

Step 3: Confirm hours and walk-in rules before you leave

SNHD notes that hours on its own pages do not always match. The Sexual Health Clinic page and the Express Testing page list different hours for the Decatur and Fremont sites. The Center's health center section and its site footer also show different hours.

Because of that, call the clinic or check its page the same day. Ask these questions:

Are you taking walk-ins today?
Which of my tests can be read at the visit?
When and how will I get the rest of my results?
What will it cost?

Step 4: Choose Express Testing, a full visit, or both

SNHD describes Express Testing as a fast, free, walk-in service for people who do not have symptoms. If you have symptoms, or you want a clinician to look at a concern, a regular clinic visit is the better path. SNHD also provides treatment at its Sexual Health Clinic, so you can be seen and, if a clinician prescribes it, treated in one place.

Walk-in lines can fill. Going early in the day gives you the best chance of being seen before capacity is reached.

Step 5: Complete the visit

Expect a short intake. You may be asked about symptoms, partners and recent exposures. These questions are routine, and they exist to pick the right tests. They are not a judgment.

Depending on the tests, you might give a urine sample, a swab, a finger-prick or a blood draw. A clinician or staff member will explain each one.

Step 6: Set up how you will receive results

Before you leave, ask the staff how results are shared. Ask whether they call, message or require a return visit. If your result will come after the visit, ask what number or portal they will use, and what to do if you do not hear back.

Under Nevada rules (Nevada Administrative Code chapter 441A), health care providers must report cases or suspected cases of chlamydia, gonorrhea, HIV and syphilis to the local health authority. That is a public health duty, and the clinic can explain how it works.

Step 7: Follow up on every result

A result is not the end of the process. If a test is positive, a clinician explains the next steps. Bacterial infections such as chlamydia, gonorrhea and syphilis, and trichomoniasis, are curable with treatment from a clinician. HIV and herpes are not curable, but they are treatable and manageable. If a result is negative, ask the clinician whether retesting makes sense for your situation.

Window periods: why timing of the test matters

A test can only detect an infection after enough time has passed since an exposure. This is called the window period. For HIV, the CDC says the time depends on the test type:

Nucleic acid tests can usually detect HIV 10 to 33 days after an exposure.
Antigen/antibody tests done on a lab blood draw can usually detect HIV 18 to 45 days after an exposure.
Antigen/antibody tests done on a finger-prick can take longer, usually 18 to 90 days.
Antibody tests can take 23 to 90 days.

These ranges come from the CDC's HIV testing information. Ask the clinician which type of rapid test they use, since that affects when a result is most informative. For the other infections, the CDC does not give one simple number that fits every test, so ask the clinic how its tests handle recent exposures.

A recent exposure does not mean you should stay home. It means a clinician may suggest testing now and again later. The clinic can also talk about post-exposure options. SNHD and The Center both list PEP among their services, and a clinician decides whether it fits. Time matters with PEP, so call as soon as you can if this applies.

Tips for a smoother visit

Go early. Walk-in services can reach capacity, per SNHD.
Call ahead if you can. Hours and walk-in rules can change, and the sources show some conflicts.
Ask about cost before testing. SNHD says nobody is turned away on the day of the visit for inability to pay. The Center says HIV testing is free and STI screening is low cost.
Bring your questions in writing. It is easy to forget them once you are in the room.
Ask about testing every site. Throat, rectal and genital exposures may each call for a different sample. A clinician can say which apply to you.
Minors can get care. Nevada law (NRS 129.060) sets no minimum age. A minor may give express consent to examination and treatment for sexually transmitted diseases and to STD prevention services.

Common mistakes to avoid

Expecting every result at the visit. Lab-based tests for chlamydia and gonorrhea usually take longer. Plan your week around that.
Skipping the question about test type. Different rapid HIV tests have different window periods, per the CDC.
Arriving at closing time. The Fremont site asks people to arrive by 5:30 PM for processing.
Using Express Testing when you have symptoms. SNHD describes it for people who do not have symptoms. If you have symptoms, tell staff so they can route you to a clinic visit.
Not confirming how you will get your results. Make sure the clinic has a working number.
Delaying a call because of embarrassment. Clinic staff see this every day, and testing is a routine part of health care.

If you prefer to test at home

Home options exist, but they are not same-day. SNHD runs Collect2Protect for Nevada residents. It offers at-home HIV self-test kits and mail-in kits for gonorrhea and chlamydia. SNHD states that the mail-in kits have a fee, that no insurance or Medicaid is accepted, and that results can be ready within 7 to 10 business days after the lab receives the sample. Check the Collect2Protect page for current details and prices.

Together TakeMeHome, a program involving the CDC, offers free mailed HIV self-tests to people 17 and older in the U.S., with two available every 90 days. Self-tests have their own window periods, so read the instructions that come with the kit.

Expected results: what you might hear and when

Here is what you can reasonably expect, using careful language:

A rapid HIV test may produce a result during your visit, often within minutes to an hour. A clinician will explain what it means and whether any follow-up test is needed.
A rapid syphilis test, where offered, may also give a quick answer. Ask the clinic whether it offers one.
Chlamydia and gonorrhea NAATs usually come back in about 1 to 3 days, though the timing may be longer depending on the lab.
Blood tests sent to a lab may take a few days. The clinic can tell you its usual time.
Any positive result usually leads to a conversation with a clinician about treatment or confirmation testing. Treatment is prescribed by the clinician, and your clinic will explain it.

No test is perfect, and a result reflects the moment the sample was taken. A clinician can tell you what your results mean for you.

Why testing is a normal part of life in Las Vegas

STIs are common in Southern Nevada. The Nevada DPBH Office of State Epidemiology reported a 2023 chlamydia rate of 525.2 cases per 100,000 people in Clark County. The same report listed gonorrhea at 241.1 per 100,000. These figures reflect diagnosed and reported cases in the county, so they do not show how any one person is doing. They do show why routine testing is a regular part of health care here.

Next step: find free or low-cost testing

You have several local choices, from free Express Testing at SNHD to low-cost screening at The Center and sliding-scale care at Nevada Health Centers. You can also use the CDC's GetTested locator to find more testing sites. Call ahead, confirm the hours, and ask which of your tests can be read the same day.

Same-Day STD Testing in Las Vegas: Rapid Tests and Quick Results