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STD Test Results: How Long They Take and What They Mean

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STD Test Results: How Long They Take and What They Mean

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 STD test results is stressful for many people, and the process is often unclear. This page covers how long results take, how soon testing works, what the common result words mean and what usually happens next in Chicago. The facts come from the CDC, the Illinois Department of Public Health (IDPH) and the Chicago Department of Public Health (CDPH).

How long STD test results take

How long do STD test results take?

It depends on the test and the clinic. The CDC says rapid HIV tests give a result in about 30 minutes or less, while tests sent to a laboratory can take several days. The clinic pages for Chicago sites do not list turnaround times for most tests, so ask how long yours will take before you leave.

Which tests can come back the same day?

Rapid HIV tests are the usual same-day option. Howard Brown Health and the Ruth M. Rothstein CORE Center both list rapid HIV testing, and Cook County Health says same-day HIV and STI services are provided at its walk-in STI Screening Clinic. Many other tests are processed in a lab, so those results arrive later.

Why can lab results take longer?

A lab sample has to be collected, shipped, processed and reviewed before a clinic can share it. Some results also need a second test to confirm them. A clinic can tell you its usual timeline.

What if I have not heard back?

Call the clinic where you were tested. Not hearing anything is not a result, so it is worth a call. Clinic numbers are listed below, and the Illinois HIV/STD Hotline at 1-800-243-2437, listed by IDPH, can point you to services.

How soon can you test for an STD?

How soon can you test for an STD after exposure?

The answer depends on the infection and the type of test. The CDC publishes clear timing for HIV, covered in the next answer. For other infections, a clinician can tell you when a test is most likely to be useful. You can talk to a clinician at any time, including about symptoms or prevention, without waiting for a window to pass.

How soon can an HIV test detect HIV?

The CDC lists these windows after an exposure. A nucleic acid test can detect HIV about 10 to 33 days after. An antigen/antibody lab test on blood from a vein works about 18 to 45 days after. An antigen/antibody finger-prick test works about 18 to 90 days after. HIV self-tests, which detect antibodies, work about 23 to 90 days after.

What is a window period?

A window period is the time between an exposure and the point when a test can reliably pick up the infection. The window differs for each infection and each test type. A clinician can match the timing to your situation.

Can a test be negative inside the window period?

Yes. A test taken during the window period may not detect an infection that is still too new to show up. That is why a clinician may suggest repeating a test after the window has passed.

When should testing be repeated?

The CDC STI Treatment Guidelines (2021) recommend retesting for chlamydia and gonorrhea about three months after treatment. For other infections, the right timing depends on the test and the situation. Ask your clinician for a plan.

What your results mean

What does a negative result mean?

A negative result means the test did not detect that specific infection in that sample at that time. It does not cover exposures after the sample was taken or infections that were not tested. A clinician can explain what a negative result means for you.

What does a positive result mean?

A positive result means the test found signs of that infection. Clinicians often confirm it and explain next steps. The CDC says chlamydia, gonorrhea, syphilis and trichomoniasis are curable with treatment from a clinician. HIV, herpes and HPV are not curable but are treatable or manageable.

What does a reactive result mean?

Reactive usually describes a preliminary screening result, most often for HIV. The CDC says a reactive screening result needs follow-up testing before it is considered a final result. Your clinician will arrange that follow-up and go over it with you.

What if a result is inconclusive or invalid?

This usually means the test could not give a clear answer, for example because of a sample problem. It is not a positive or a negative. A clinic will typically repeat the test, so ask what they recommend.

Does one result cover every STD?

No. Each test looks for specific infections, and a panel covers only what was ordered. The US Preventive Services Task Force (USPSTF) recommends against routine genital herpes screening in people without symptoms, so herpes is often not part of a standard panel. Ask which infections were included in your testing.

Getting results in Chicago

How will I receive my results?

Clinic pages in Chicago do not publish how results are delivered, so ask at your visit. Common options are a phone call, an online portal or an in-person visit. Confirm that the contact number on file is one you can answer privately.

Are results reported to the health department?

In Illinois, HIV, syphilis, gonorrhea and chlamydia are reportable. Under 77 Ill. Adm. Code Part 693, health care professionals report within seven days, and in Chicago reports go to CDPH. Reporting is a public health function.

Can a minor get tested without a parent?

Illinois law, 410 ILCS 210/4, says a minor 12 or older who may have come into contact with an STD can consent to prevention, diagnosis or treatment services. The law also says providers must report each STD incident to public health. Providers may make reasonable efforts to involve family if they believe it will not be harmful.

Where can I get tested for free or at low cost?

CDPH Sexual Health Specialty Clinics in Lakeview, Austin and Roseland provide care regardless of ability to pay. Their page says to call for an appointment, notes limited walk-ins and says to call the clinic to verify hours. Howard Brown Health offers walk-in testing with a sliding fee program, and Cook County Health's walk-in STI Screening Clinic takes calls on weekdays from 8:30 am to 3:30 pm. See the list of Chicago testing options and what they cost, or use the CDC GetTested locator.

What happens next

What happens after a positive result?

A clinician explains the result and, when treatment applies, prescribes it. Treatment is decided by the clinician for each person. Many clinics, including the CDPH Sexual Health Specialty Clinics, list treatment among their services.

What about partners?

According to the CDC, Illinois permits expedited partner therapy for chlamydia, gonorrhea and trichomoniasis, meaning a clinician may provide treatment for partners exposed in the previous 60 days. Syphilis is not covered. Ask your clinician how partners can be tested or treated.

Is testing common in Chicago?

Yes. IDPH reported a chlamydia rate of 1,023.7 per 100,000 people in Chicago in 2022, and the CDC lists Illinois among states with high chlamydia rates. STI testing is routine health care, not a judgment about anyone.

Does doxy-PEP replace testing?

No. The CDC's 2024 doxy-PEP guidance describes it as one prevention option that clinicians discuss with some people. A clinician prescribes it, and regular STI testing still matters. Howard Brown Health offers it by appointment.

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