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 hard. Many people in San Diego want to know if same day STD testing is possible, and how long STD test results take once they are tested.

The honest answer is that it depends on the test. Some can return a result during the visit. Others go to a lab and take a few days.

This guide walks you through the process in order. You will learn which tests are rapid, how to choose a clinic, what to bring and what to ask. It also covers how to read the timeline for your STD test results.

What you need before you start

A list of the tests you are interested in, or a plan to ask a clinician which ones fit your situation.
A rough timeline of your most recent possible exposure. Approximate dates are fine.
A phone number where you are comfortable getting a call or message.
Insurance information if you have it. Many sites also test without insurance.
A photo ID if the clinic asks for one. Check when you call.
Time. A rapid test can be quick, but the whole visit often takes longer than the test itself.
Any questions you want to ask. Writing them down helps.

Step 1: Know which tests can give same-day results

Not every STD test works the same way. Some use a finger prick or an oral swab and give a result in the clinic. Others need a sample sent to a lab.

Tests that can be rapid

HIV. Rapid HIV tests are widely available. They use a finger-stick blood sample or an oral swab. The result is often ready while you wait or within a short time. The CDC notes that a positive rapid result needs a follow-up test to confirm it.

Syphilis, where offered. Syphilis is usually found with a blood test sent to a lab. Some sites offer a rapid point-of-care version. Ask the clinic directly whether it offers one, because not every site does.

Hepatitis C, at some sites. A CDC directory listing for the San Diego LGBT Community Center says it offers rapid hepatitis C testing on site.

Tests that usually take longer

The CDC's 2021 STI Treatment Guidelines recommend nucleic acid amplification tests, called NAATs, for chlamydia and gonorrhea. These can use a urine sample or a swab. The sample usually goes to a lab. Results often come back in about 1 to 3 days, though the lab and the clinic set the timing.

Herpes testing is different. If you have a sore, a clinician can swab it and send the sample for testing. Results also take time. Ask your clinician what testing makes sense for you, since that depends on your symptoms and history.

Hepatitis B, trichomoniasis and other tests also vary by clinic. When you call, ask which results come the same day and which come later.

Step 2: Understand window periods

A window period is the time after an exposure when a test may not yet detect an infection. A test taken inside that window can be negative even if an infection is present. That is why timing matters as much as speed.

The CDC gives these general HIV windows. A nucleic acid test can usually detect HIV 10 to 33 days after exposure. An antigen/antibody lab test on a blood draw can usually detect it 18 to 45 days after exposure. Antigen/antibody tests on a finger-stick sample take longer, about 18 to 90 days. Antibody-only tests can take 23 to 90 days.

Rapid tests are often finger-stick or oral tests, so they can fall on the longer end. A clinician can help you work out whether to test now, test again later, or do both.

For chlamydia, gonorrhea and syphilis, ask the clinician how your timeline affects the result. The right answer depends on the test and your situation.

Step 3: Choose a San Diego clinic and check how it works

Whether you can get tested the same day often comes down to walk-in access. Here is what the published listings say. Details can change, so confirm by phone before you go.

Hillcrest Family Health Center (daytime)

Family Health Centers of San Diego runs this clinic at 4094 4th Avenue. Its page says walk-ins are welcome, Monday through Friday, 8:00 a.m. to 5:00 p.m. It lists STI screening and treatment, HIV services, PrEP and PEP. The page says the clinic may be able to waive fees or help with insurance enrollment. Appointments: (619) 515-2300. Information: (619) 515-2545.

The Night Clinic at Hillcrest Family Health Center

This evening clinic is at the same address. Its page lists hours of Monday through Thursday, 5:00 to 9:00 p.m., and says walk-ins are welcome. It describes free and confidential HIV testing and low-cost STI tests. It also lists hepatitis testing, PrEP, PEP, doxy-PEP and STI treatment. A page does not list Friday hours, so call to check. Phone: (619) 515-2545.

San Diego LGBT Community Center

The Center is at 3909 Centre Street. A CDC NPIN listing says appointments are not required and that services have no fee. It lists on-site chlamydia, gonorrhea and syphilis testing, plus rapid HIV and rapid hepatitis C testing. The listing shows Monday through Friday, 10:00 a.m. to 8:00 p.m., and Saturday, 10:00 a.m. to 4:00 p.m. It also says to call for STD and HIV testing hours, and another source describes an appointment contact. So call 619-692-2077 before you go.

Planned Parenthood College Avenue

The center is at 4575 College Ave. A CDC GetTested listing says an appointment is not required. It lists rapid and blood HIV tests, and herpes, chlamydia, gonorrhea and syphilis tests. Payment options include insurance, Medicaid and a sliding scale. The listing gives no hours, so call (888) 743-7526.

County of San Diego Central Public Health Center

The county's sexual health clinic is at 5101 Market St. A CDC GetTested listing says the STI and HIV tests are free, that it accepts insurance, Medicaid and Medicare, and that charges are based on income. It also says an appointment is required, while other county materials describe walk-in service. Because those sources conflict, call (619) 229-5400 to confirm how it works and whether you are eligible.

The local testing list gathers these options in one place. You can also use the CDC's GetTested tool at gettested.cdc.gov to search by ZIP code.

Step 4: Call ahead with the right questions

A short call can save you a wasted trip. Here is what to ask:

Do you offer walk-in testing today, or do I need an appointment?
Which tests do you offer, and which give results during the visit?
How are the results delivered, and how long will each one take?
What does testing cost, and is there a free or sliding-scale option?
Do I need ID or insurance?
Can I talk to someone about PrEP or PEP if that is relevant?

If a price or hours are not on the clinic's page, ask. Do not assume.

Step 5: Get tested

At the visit, staff will usually ask a few questions about your history and any symptoms. These are routine and meant to help them choose the right tests. You can answer in your own words.

Then you will give samples. Depending on the tests, that can be a urine sample, a swab, a finger prick, an oral swab or a blood draw. Most take only a few minutes.

If you are a minor in California, the state's Family Code section 6926 lets people age 12 and older consent to their own diagnosis and treatment of reportable sexually transmitted infections. It also covers care to prevent STDs. The Guttmacher Institute lists no parental notification rule for California. Ask the clinic about its own privacy practices.

Step 6: Ask how you will get your results

Before you leave, confirm how and when results will reach you. Ask:

Will I get a phone call, a text, a portal message or an in-person talk?
What number will you call from, and what is the usual timeframe?
What should I do if I have not heard back by then?

Most places contact you directly with test results from a lab. Many places prefer to share a positive result by phone or in person, rather than by message.

Step 7: Plan for follow-up

Some results need more steps. A rapid HIV result that is reactive needs a confirming test, per the CDC. A negative result taken inside a window period may call for a repeat test. A clinician can explain which applies to you.

If a test finds a bacterial infection, treatment comes from a clinician. Chlamydia, gonorrhea and syphilis are curable with treatment prescribed by a clinician. Trichomoniasis is also curable. HIV and herpes are not curable, but they are treatable and manageable with care from a clinician.

California's Health and Safety Code section 120582 also allows clinicians to provide treatment for sexual partners of a person diagnosed with certain infections, such as chlamydia or gonorrhea, without examining them first. Ask your clinician whether this applies.

What to expect from your results

Here is a general guide. Your own timeline can differ.

Test	How it is done	When results may come
Rapid HIV	Finger stick or oral swab	Often during the visit or shortly after
Rapid syphilis, where offered	Finger stick	May be during the visit; ask the clinic
Chlamydia and gonorrhea (NAAT)	Urine or swab sent to a lab	Usually about 1 to 3 days
Syphilis blood test	Blood draw sent to a lab	Varies by lab; ask the clinic
Herpes (from a sore)	Swab sent to a lab	Varies by lab; ask the clinic

A negative result may mean no infection was detected at the time of the test. It does not rule out an infection that is still inside its window period. A positive result is a reason to talk with a clinician about confirmation and treatment options. Only a clinician can interpret your results.

Tips that make the day easier

Go early in the day. Walk-in lines can be shorter, and you leave time for a lab draw.
Check evening hours. The Night Clinic's published hours run until 9:00 p.m. Monday through Thursday.
Bring a list of medicines. This helps if you talk about PrEP, PEP or treatment.
Ask about the full panel. Different body sites, such as throat or rectum, can need separate samples. A clinician can tell you which fit your history.
Keep your phone on. Lab results often arrive by call from a number you may not recognize.
Ask about cost before the tests. If a price is not listed, a staff member can tell you.

Common mistakes to avoid

Expecting every result on the same day. Rapid tests exist for some infections, but not for all of them.
Skipping the window period question. A very early test can miss an infection. Ask when to repeat.
Not confirming walk-in status. Listings can differ. A quick call avoids a wasted trip.
Leaving without a results plan. Know how you will be contacted.
Waiting on a reactive rapid result. A confirming test is part of the process, so follow through.
Letting worry stop you. Testing is a routine part of health care. Clinics see people of every gender, orientation and background every day.

Why testing in San Diego is worth doing

Local numbers show these infections are common. The Times of San Diego, reporting County of San Diego data, said the county recorded 16,414 chlamydia cases and 6,021 gonorrhea cases in 2024. The same report counted 309 cases of primary and secondary syphilis. Case counts only include infections that were found and reported, so the true number may be higher.

Many infections cause no symptoms, which is why the CDC recommends regular screening for many groups. A clinician can tell you how often fits your situation.

Other ways to test

If getting to a clinic is hard, Family Health Centers of San Diego lists at-home or mail-in testing on its prevention page. It names TakeMeHome and Don't Think, Know. The page does not state eligibility or cost, so check with the program. For a positive at-home result, the page lists (619) 876-4462.

Next steps

You do not have to do everything in one day. Start with a call, pick a clinic from the list, and ask which results come the same day. Free and low-cost testing is available in San Diego, and you can also search by ZIP code at gettested.cdc.gov.

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