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.

Waiting for answers is often the hardest part of getting tested. This guide explains how same day STD testing in Chicago works, which tests can return a result during your visit, and which ones need a few days.

Short version: some tests give a result in minutes, and others go to a lab. Knowing the difference helps you plan your day and know what to expect.

What "same-day" can and cannot mean

A same-day visit and a same-day result are two different things. Many Chicago clinics can see you on the same day. That does not mean every result comes back before you leave.

The CDC STI Treatment Guidelines (2021) describe several kinds of tests. Each one works differently, and that is what sets the wait.

Rapid HIV tests use a finger-stick blood sample or an oral swab. Results are usually ready in the same visit.
Rapid syphilis tests exist, but only some clinics offer them. Ask before you go.
Lab-based nucleic acid amplification tests (NAATs) are the standard for chlamydia and gonorrhea. The sample is sent to a lab, and results often take about one to three days. The lab and the clinic set the actual timing.
Lab-based blood tests for HIV, syphilis and hepatitis usually take longer than rapid tests.

So when people ask how long do STD test results take, the honest answer is "it depends on the test." A rapid HIV test may take minutes. A lab test often takes days.

What you need before you go

You do not need much. A short checklist helps the visit go smoothly.

A phone to call the clinic first. Hours and walk-in rules can change.
Your insurance card, if you have insurance. The Chicago Department of Public Health (CDPH) asks insured patients to bring one.
A photo ID if you have one. Ask the clinic whether it is required.
A short list of your questions, symptoms (if any) and recent exposures. A clinician can use these to choose the right tests.
A safe phone number or email for follow-up. Ask how the clinic will contact you with lab results.
Time. Walk-in visits can involve a wait, so plan for a longer stop.

You do not need to prepare in any special way for most tests. For urine tests, ask the clinic whether they want you to avoid urinating for a while before the visit.

Step-by-step: how to get tested in Chicago, fast

Step 1: Decide what you want to be tested for

Start with your goal. Do you want a routine check, or do you have a specific exposure or symptom on your mind? A clinician can help you sort this out. The CDC STI Treatment Guidelines (2021) recommend that testing be based on your age, body parts exposed, partners and risk, not on a one-size-fits-all list.

If you are unsure, say so. Clinic staff hear this question every day. You can also call the Illinois HIV/STD Hotline at 1-800-243-2437, which the Illinois Department of Public Health (IDPH) lists on its STD page.

Step 2: Pick a clinic that fits your timing

Some Chicago clinics take walk-ins. Others ask you to call first. Here is what the clinics' own pages say.

Clinic	Walk-in or appointment	Phone
Howard Brown Health walk-in sexual health clinic (Sheridan, 63rd St. and Broadway Youth Center sites)	Howard Brown says "no appointment necessary" and patients are seen first come, first served.	773.388.1600
Ruth M. Rothstein CORE Center, Cook County Health, 2020 W. Harrison St.	Cook County Health lists a walk-in STI Screening Clinic with same-day HIV and STI services. Call Monday to Friday, 8:30 am to 3:30 pm.	312-572-4700
CDPH Sexual Health Specialty Clinics (Lakeview, Austin, Roseland)	CDPH says to call for an appointment and that limited walk-ins are available.	Lakeview 312.744.5507, Austin 312.746.4871, Roseland 312.747.1090
Planned Parenthood of Illinois, Rogers Park Health Center, 5725 N Broadway	CDC's GetTested locator lists an appointment as required.	(773) 942-7193

For addresses and more options, see the local testing list. For a fuller look at costs and clinic types, read our guide to STD testing in Chicago and what it costs.

You can also use the CDC's locator at gettested.cdc.gov to find more sites by ZIP code.

Step 3: Call ahead and ask three questions

Even walk-in clinics can change hours, and CDPH's own page says to call the clinic to verify hours. A quick call saves a trip. Ask:

Do you take walk-ins today, and when should I arrive?
Which tests can give a result during the visit, and which go to a lab?
How and when will I hear about lab results?

If you want a rapid syphilis test, ask directly. The clinic pages we reviewed list syphilis testing, but they do not say whether the syphilis test is a rapid one. Confirm before you go.

Step 4: Plan around the clinic's hours

CDPH lists its clinics as closed from 12 to 1 pm daily and on City holidays. As one example, CDPH lists the Lakeview clinic at 2849 N. Clark St. as open Monday, Wednesday and Friday from 8:00 am to 4:00 pm, and Tuesday and Thursday from 9:00 am to 5:00 pm. Other CDPH sites have different days, so check each one.

Arriving early in the day gives you more room if there is a wait. It also leaves time for a lab visit or follow-up questions.

Step 5: Go to the visit and speak plainly

You will usually be asked about symptoms, partners and past testing. Clinicians ask these questions to pick the right tests, not to judge you. Tell them about every body part that may have been exposed, since the CDC STI Treatment Guidelines (2021) note that throat and rectal testing can be needed in addition to urine or genital samples.

Samples may include a urine sample, a swab (which you can sometimes collect yourself), or a blood draw or finger stick. Each is usually quick.

Step 6: Ask how you will get each result

Before you leave, confirm these points in writing if you can:

Which results you will get today.
Which results are pending at a lab, and how long that usually takes.
Whether the clinic calls, texts, uses a patient portal or asks you to return.
Who to call if you do not hear back.

Not hearing back is not a result. If a clinic told you to expect a call and nothing came, call them.

Step 7: Follow up on your results

A clinician is the right person to explain what your results mean for you. If a test comes back positive, a clinician can talk through treatment. Bacterial STIs 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. Your clinician will explain the options.

If you are told a partner may need care too, ask about next steps. Illinois law allows expedited partner therapy for chlamydia, gonorrhea and trichomoniasis, according to the CDC's legal status page for Illinois. A clinician decides whether it applies. It does not cover syphilis.

Understanding std test results and timing

Two things shape std test results: how fast the test runs, and when the test can pick up an infection after an exposure.

Speed of the test

Rapid tests are built to give a quick result at the visit. Lab tests are more involved. Samples travel to a lab, are run in batches, and are then reported back to your clinic.

Weekends and holidays can add time. If your lab result is not back when expected, ask the clinic.

Window periods

A window period is the time after an exposure when a test may not yet detect an infection. The CDC publishes window periods for HIV on its HIV testing pages. According to the CDC:

Nucleic acid tests can usually detect HIV 10 to 33 days after exposure.
Antigen/antibody tests done on a lab blood draw can usually detect it 18 to 45 days after exposure.
Antigen/antibody tests done on a finger stick can take longer, around 18 to 90 days.
Antibody tests, which include many rapid tests, can take 23 to 90 days.

That means a rapid HIV test soon after an exposure may be too early to show an infection. A clinician can tell you whether and when to retest. If you think you were recently exposed, ask about PEP, which a clinician prescribes and which works best when started quickly. Howard Brown lists PEP among its services.

For chlamydia, gonorrhea and syphilis, this guide does not give a window period. Ask your clinician how the timing of your exposure affects when to test.

What to expect afterward

Here is a realistic picture of what the day may look like.

A rapid HIV test may give a result within the visit. A clinician will explain what it shows and what, if anything, comes next.
A urine or swab test for chlamydia and gonorrhea may be sent out. Results often arrive in about one to three days, though your clinic's lab sets the exact timing.
Blood tests for syphilis and hepatitis may also take a few days, unless the clinic offers a rapid version.
A reactive or positive rapid result may need a follow-up test to confirm it. That is a normal part of the process.

No test is perfect. Results can be affected by timing and by how a sample was collected, so talk with a clinician about any result that surprises you.

Tips for a smoother visit

Go early. Walk-in clinics can fill up, especially midday and after work.
Ask about cost before the visit. CDPH says care is provided regardless of ability to pay or insurance status, but its page does not say the visit is free. Howard Brown describes its walk-in clinic as low-cost and offers a Sliding Fee Discount Program based on income and family size. CDC GetTested lists the CORE Center as accepting insurance and Medicaid, with a sliding scale.
Bring your questions. Ask about vaccines, such as HPV or hepatitis, and about PrEP. Several of the clinics above list those services.
Ask about PrEP coverage. IDPH runs PrEP4Illinois, a medication assistance program, with a helpline at 1-833-773-7445. It requires proof of Illinois residency and of any insurance.
Know your privacy rights as a young person. Under the Illinois Consent by Minors to Health Care Services Act (410 ILCS 210/4), a minor age 12 or older who may have come into contact with a sexually transmitted disease can consent to prevention, diagnosis or treatment services. Parental consent is not necessary. Providers may make reasonable efforts to involve the family if they believe it will not be harmful.
Ask about reporting. Under Illinois rules (77 Ill. Adm. Code Part 693), some infections, including HIV, syphilis, gonorrhea and chlamydia, must be reported by the health care professional to public health. In Chicago, reports go to the local health department.
Look at youth options. Howard Brown's Broadway Youth Center is listed as a walk-in site, and its site describes services for ages 12 to 24.

Common mistakes to avoid

Assuming a walk-in is always open. Hours change. Call first.
Expecting every result on the spot. Many tests go to a lab.
Testing only once after a recent exposure. Because of window periods, a clinician may suggest a repeat test.
Skipping body sites. Tell the clinician where exposure happened so the right samples are taken.
Leaving without a follow-up plan. Ask how and when results will reach you.
Treating silence as an answer. If you have not heard back, contact the clinic.
Waiting for symptoms. Many STIs cause no symptoms, so a clinician can advise on testing based on your situation.

If you cannot get to a clinic today

You still have options. Call the Cook County Health walk-in line on a weekday morning, or call CDPH to ask about the next open appointment. You can also call the Illinois HIV/STD Hotline at 1-800-243-2437 for guidance on where to go.

Do you have an urgent concern, such as severe pain or a recent high-risk exposure? Contact a clinician or urgent care right away and ask about care and PEP.

The CDPH sexual health page has the latest information on its clinics: CDPH Sexual Health Services.

Why testing matters in Chicago

Testing is a routine part of health care, and it is common in this city. The Illinois Department of Public Health reports that the City of Chicago had a chlamydia rate of 1,023.7 per 100,000 people (27,596 cases) in 2022, and a gonorrhea rate of 459.3 per 100,000 (12,382 cases). For the same table, IDPH lists primary and secondary syphilis at 29.9 per 100,000 (806 cases). These are 2022 figures, and IDPH uses 2010 Census population to calculate them.

These numbers are one reason clinics here offer walk-in and low-cost options. They are not a reason for fear. Testing and, when needed, treatment from a clinician are how people look after their health.

Your next step

Pick one clinic from the table, call to confirm walk-in hours, and ask which results you can get the same day. If you want more options, browse gettested.cdc.gov or use the local testing list.

Free and low-cost testing is available in Chicago. Getting tested is a normal, caring thing to do for yourself and for the people in your life.

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