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.

Getting an HIV test in San Diego can take less than an hour, and several local clinics offer it at no charge. This guide walks you through it in order. You will see what to prepare, how to choose a test, where to go, what happens during the visit and how to understand the result.

The CDC recommends that everyone ages 13 to 64 get tested for HIV at least once, and that people with more risk get tested more often. The U.S. Preventive Services Task Force (USPSTF) recommends screening for people ages 15 to 65. An HIV test is routine health care, not a judgment about anyone.

Quick overview

Time needed: a rapid test usually takes about 20 minutes to run, and most visits fit in an hour. Check each clinic for its own timing.
Cost: some San Diego sites list HIV testing as free. Others use a sliding scale based on income.
Appointment: some sites welcome walk-ins and some ask you to call first. Details are in Step 3.
Result: a rapid test gives a same-visit result. A lab test usually takes longer.

Materials you need

You do not need much. This short list covers it:

A way to get to the clinic during its open hours.
A rough date for your most recent possible exposure. This helps the clinician pick the right test.
Your insurance card, if you have one. Several local clinics accept insurance, but a card is not required for the free options.
A list of any medicines you take, and any questions you want to ask.
Photo ID, if the clinic asks for it. Each clinic sets its own rules, so confirm when you call.
About an hour of time, and a phone for follow-up.

You do not need to fast or prepare your body. Eating, drinking and your usual routine do not change an HIV test.

Step 1: Understand the types of HIV tests

The CDC describes three main kinds of HIV tests. They look for different things in your body, so they detect HIV at different times after an exposure.

Antibody tests

Antibody tests look for the proteins your immune system makes in response to HIV. Most rapid tests, including those done with a finger prick or a swab of the mouth, are antibody tests. The CDC says antibody tests can take 23 to 90 days after an exposure to detect HIV. Tests that use blood from a vein usually detect HIV sooner than finger-prick or oral tests.

Antigen/antibody tests

These tests look for antibodies and also for a part of the virus called p24 antigen. The CDC says an antigen/antibody test done on blood from a vein at a lab can detect HIV 18 to 45 days after an exposure. A finger-prick antigen/antibody test can take 18 to 90 days. Some clinics also offer rapid versions of this test.

Nucleic acid tests (NAT, or RNA tests)

A nucleic acid test looks for the virus itself in the blood. The CDC says a NAT can detect HIV 10 to 33 days after an exposure. These tests are more costly and are not used for routine screening. A clinician may suggest one after a recent high-concern exposure or if symptoms point to a new infection.

The time between an exposure and the point a test can detect HIV is called the window period. The numbers above come from the CDC. Your own timing can differ, so ask the clinician which test fits your dates.

Step 2: Decide whether it has been long enough since your last exposure

This is the step people skip most often. A test can only detect HIV once enough time has passed. If you test inside the window period, a negative result may not be the final answer.

Write down the date of your most recent possible exposure.
Count the days since then.
Compare that number with the CDC window periods in Step 1.
Tell the clinician your timeline. They can choose a test or suggest a repeat test later.

If your exposure was in the last 72 hours, tell a clinician right away. The CDC says post-exposure prophylaxis (PEP) is a medicine a clinician can prescribe that may lower the chance of HIV after an exposure, and it must start within 72 hours. Among the local clinics listed below, the Hillcrest Family Health Center and The Night Clinic list PEP among their services. Call ahead and say you are asking about PEP.

Step 3: Choose where to go in San Diego

Below are the sites with the clearest published details. For a fuller list with more options, see the local testing list. Hours and policies change, so call before you go.

San Diego LGBT Community Center (The Center)

The Center is at 3909 Centre Street, San Diego, CA 92103. The CDC's National Prevention Information Network (NPIN) lists no fee for services and says appointments are not required. It also lists rapid HIV testing and rapid hepatitis C testing. The listing gives hours of Monday to Friday 10:00 a.m. to 8:00 p.m. and Saturday 10:00 a.m. to 4:00 p.m., and notes to call for STD and HIV testing hours. Call 619-692-2077 to confirm that testing is running when you plan to go. Everyone is welcome, whatever their gender or orientation.

The Night Clinic at Hillcrest Family Health Center

The Night Clinic is at 4094 4th Avenue, San Diego, CA 92103. Family Health Centers of San Diego says it offers free and confidential HIV testing and low-cost STI tests. The page lists Monday to Thursday, 5:00 p.m. to 9:00 p.m., with walk-ins welcome and free parking. It does not list Friday hours. The information line is (619) 515-2545, and the appointment line is (619) 515-2300. This site also lists PrEP, PEP and doxy-PEP, which are medicines a clinician prescribes.

Hillcrest Family Health Center, daytime clinic

The daytime clinic is at the same address, 4094 4th Avenue. Family Health Centers of San Diego lists Monday to Friday, 8:00 a.m. to 5:00 p.m., says walk-ins are welcome and says it may be able to waive fees or help with insurance enrollment. Call (619) 515-2300 for appointments. The page does not list a price, so ask when you call.

County of San Diego Central Public Health Center

The county sexual health clinic is at 5101 Market St, San Diego, CA 92114. The CDC's GetTested directory lists a free HIV test, says the clinic accepts insurance, Medicaid and Medicare, and says charges are based on income. The directory also says an appointment is required. The county's own materials may say something different, and I could not confirm which is current. Call (619) 229-5400 to check the policy and your eligibility. The clinic's hours were not published in the sources I checked.

Planned Parenthood, College Avenue

This site is at 4575 College Ave, San Diego, CA 92115. The CDC GetTested directory lists rapid HIV and blood tests, says no appointment is required and lists insurance, Medicaid and sliding-scale payment. Hours were not listed, so call (888) 743-7526 first.

Home testing and PrEP-only clinics

Family Health Centers of San Diego lists at-home or mail-in testing programs called TakeMeHome and Don't Think, Know on its prevention page. The page does not state who qualifies or what it costs, so ask the health center before relying on either. For a reactive at-home result, the page says to call (619) 876-4462.

The UC San Diego Health Owen Clinic runs a PrEP clinic for people who do not have HIV. Its page does not mention STI or HIV testing. Call 619-543-3995 if you want to ask about PrEP.

You can also search by ZIP code at gettested.cdc.gov, the CDC's directory of testing sites.

Step 4: Call ahead and ask the right questions

A two-minute call saves a trip. Ask these questions:

Is HIV testing available today, and until what time?
Do I need an appointment, or can I walk in?
Is the test free, or what will it cost without insurance?
Is it a rapid test? Is it an antibody or an antigen/antibody test?
How long until I get a result?
Is the visit confidential?
Can I be tested for other infections at the same visit?

You do not have to give a reason for calling. Clinic staff answer these questions every day.

Step 5: Go to your visit

Here is what usually happens at a rapid HIV test visit:

Check-in. You give basic information and may fill out a short form.
A brief conversation. A counselor or clinician may ask about your last exposure and what you want from the visit. You can answer only what you are comfortable with.
The sample. Depending on the test, this is a finger prick, an oral swab or a blood draw from a vein.
The wait. A rapid test is typically read after about 20 minutes, and the CDC notes rapid tests give a result in the same visit. Lab-based tests take longer.
The result and next steps. The clinician explains what the result means and what to do next.

If you are under 18, California law gives you some room to act on your own. Under California Family Code section 6926, a minor age 12 or older can consent to care for certain reportable and sexually transmitted infections and to care that helps prevent them. The Guttmacher Institute lists California as allowing minors 12 and older to access STI services and lists no parental notification rule. Ask the clinic how it handles billing and privacy for minors.

Step 6: Understand your result

A test result is one piece of information, and the clinician is the right person to explain it. These are the general outcomes.

If the result is nonreactive (negative)

This means the test did not detect HIV in your sample. If it has been long enough since your last exposure, the CDC says a negative result generally means HIV is not present. If you tested inside the window period for that test, the clinician may suggest repeating it. Ask them when. Keep the date of your last exposure in mind.

If the result is reactive (preliminary positive)

A reactive rapid result is not a final diagnosis. The CDC says a reactive screening result needs a follow-up test to confirm it. The clinic will arrange that, often on the same day. Only a confirmed result from a clinician tells you whether you have HIV.

If the confirmation does find HIV, the CDC says HIV is treatable. People with HIV who take HIV medicine as a clinician prescribes and keep the virus at an undetectable level in their blood cannot pass HIV to sexual partners, according to the CDC. HIV is not curable, but it is manageable, and most people with HIV who get care live long lives. The clinic can connect you with care, often the same day. Local clinics listed above also offer PrEP navigation for partners.

If the result is unclear

Sometimes a result needs repeating. This does not predict anything about the outcome. The clinician will tell you which test to do next.

Tips for a smoother visit

Go early in the day. A walk-in clinic can have a wait, and an early visit leaves time for a follow-up test if you need one.
Bring a friend if you want to. Support is fine, and the clinic can speak with you alone if you prefer.
Ask about other tests. Several of the clinics above also test for chlamydia, gonorrhea and syphilis. According to Times of San Diego, reporting county data, San Diego County recorded 16,414 chlamydia cases and 6,021 gonorrhea cases in 2024. Bacterial infections like these are curable with treatment from a clinician, and a test is the way to find out.
Ask about PrEP. It is a medicine a clinician prescribes to lower the chance of getting HIV. The Family Health Centers of San Diego say PrEP is available at all of their primary care clinics and may be covered by insurance or available at low or no cost.
Write your follow-up date down. If you need a repeat test, put it on your phone calendar before you leave.
Know the privacy basics. Ask how results are stored and who can see them. Each clinic can explain its policy. California's HIV laws are in Health and Safety Code section 120290, which covers infectious diseases in general and says that taking practical steps to prevent transmission, such as using condoms, negates intent.

Common mistakes to avoid

Testing too soon and stopping there. A test inside the window period can miss a recent exposure. Ask about a repeat test.
Treating a reactive rapid result as final. It needs a follow-up test. Do not make big decisions until the follow-up is done.
Skipping the call. Hours and walk-in rules vary by site and may have changed. A short call prevents a wasted trip.
Assuming a past test still counts. A negative result from last year says nothing about today. The CDC recommends repeat testing based on your situation.
Waiting out of worry. Putting off a test does not change the result. Earlier testing means earlier answers and, if needed, earlier care.
Not mentioning a recent exposure. If it was in the last 72 hours, PEP may be an option, and timing matters.
Relying on symptoms. Many people with HIV have no symptoms for years, so symptoms are not a reliable guide. Only a test can tell.

What results to expect, in plain terms

Most people who test get a nonreactive result, and many leave the clinic with their answer in under an hour. A rapid test can give a result in about 20 minutes, but no test is perfect. Timing, the kind of test and the sample type all affect what a result can show. This is why clinicians ask about your last exposure.

If you get a reactive result, you will have support. Clinics connect people to confirmation and care, and the clinicians on site can explain the next step.

Next steps

Pick a clinic from the list above or at gettested.cdc.gov.
Call to confirm hours, cost and whether you need an appointment.
Go in, get tested and write down your follow-up plan.

Whatever the result, you will know more than you did before, and that is a good reason to go.

Free and Rapid HIV Testing in San Diego