HIV test types: 4th gen, RNA, rapid and home tests

There are three types of HIV test: nucleic acid tests (NAT, often called RNA tests), antigen/antibody tests (the 4th generation test most labs use) and antibody tests, which include most rapid tests and the OraQuick and INSTI home self-tests. They differ in how soon after an exposure they can find HIV. For current prices, see our HIV test page.

Key points

• A NAT finds HIV earliest, usually 10 to 33 days after exposure. A 4th generation lab test takes 18 to 45 days.
• Rapid tests and home self-tests can take up to 90 days.
• Nonreactive means negative. It's final once the window period for your test has passed.
• A reactive rapid test or self-test needs a follow-up test.
• Two weeks is too early for most tests. After an exposure in the last 72 hours, ask about PEP now.

The three types of HIV test

Your immune system makes antibodies in response to HIV. The p24 antigen is part of the virus and shows up before antibodies do.

What is a 4th generation HIV test?

It's the lab antigen/antibody test. CDC recommends it for testing done in labs and says it's commonly used in the United States. CDC's lab guidance makes it the first test a lab runs, because it finds more early infections than tests that look only for antibodies. Most HIV tests sold by the online lab services we track are this test.

What is an HIV RNA test?

It's a nucleic acid test. It looks for the virus's genetic material in blood from a vein, so it finds HIV sooner than any other type. CDC says a NAT should be considered after a recent exposure when someone has early symptoms of HIV and a negative antibody or antigen/antibody test. Some online lab services sell one. Rapid STD Testing, for example, says a negative RNA result in the first weeks is usually followed by a 4th generation test.

Rapid and instant HIV tests

A rapid test uses a finger stick or oral fluid and gives a result in 30 minutes or less, often while you wait. CDC says most rapid tests are antibody tests, so the speed comes with a longer window period.

How soon can HIV be detected?

No test can find HIV right after infection. That gap is the window period. With blood from a vein, a NAT usually detects HIV 10 to 33 days after exposure and a 4th generation lab test 18 to 45 days after, CDC says. Our window periods guide covers other infections.

How accurate is an HIV test after 2 weeks?

Two weeks is too early for most HIV tests. At 14 days, only a NAT is inside its window range, and even a NAT can take up to 33 days. Antigen/antibody tests usually need 18 days or more. A negative result at 2 weeks can't rule HIV out, and CDC says to test again after the window period.

If the exposure was in the last 72 hours

Testing can wait. PEP is medicine that can prevent HIV, and CDC says it must be started within 72 hours. Talk to a health care provider, an emergency room doctor or an urgent care provider now.

What does nonreactive mean on an HIV test?

Nonreactive means the test found no sign of HIV, so it's a negative result. In CDC's lab guidance, a nonreactive first test needs no further testing. The result is final only if you tested after the window period and had no possible exposure during it. HIV.gov notes that it shows only your own status, not your partner's.

What a reactive result means

Reactive means the test found something that may be HIV. CDC's lab guidance calls a reactive rapid test a preliminary positive, not a diagnosis.

• After a reactive self-test, CDC says to see a health care provider for follow-up testing.
• After a reactive lab test, the lab runs follow-up tests, usually on the same blood sample.
• If the follow-up is also positive, you have HIV. If follow-up tests, including a NAT, are negative, CDC's lab guidance counts the first result as a false positive.

If you have HIV, CDC says to start treatment as soon as possible. Treatment that keeps the virus undetectable means you won't pass HIV on through sex. Our positive result guide covers next steps.

When to test again

• After a negative test inside the window period, test again once that window has passed.
• CDC recommends an HIV test at least once for everyone aged 13 to 64, and at least once a year for people with certain risk factors, such as more than one partner since the last test.
• Sexually active gay and bisexual men may benefit from testing every 3 to 6 months.

At-home HIV tests compared

An at-home HIV test kit is either a self-test you read yourself or a kit you mail to a lab. HIV.gov says only two self-tests are FDA approved:

• OraQuick HIV Self-Test, which CVS lists as the OraQuick In-Home HIV Test. You swab your upper and lower gums and read the result 20 to 40 minutes later, the FDA says. It's approved for ages 14 and older.
• INSTI HIV Self Test. It uses a drop of blood from a finger prick. The FDA approved it in October 2025 for ages 18 and older.

Both are antibody tests, and the FDA puts OraQuick's window period at about three months. In the studies the FDA cites, OraQuick found about 92% of infections, so about 1 in 12 people with HIV got a false negative. It gave about 1 false positive per 5,000 people without HIV.

Some mail-in kits send a finger-prick sample to a lab for an antigen/antibody test. CDC's 18 to 45 days is for blood from a vein, so ask which window applies.

"Same day" results mean a self-test you read at home. Our at-home STD tests guide compares kits for other infections.

OraQuick and INSTI at CVS, Walgreens, Walmart and Amazon

On November 1, 2026, CVS, Walgreens and Walmart sold OraQuick online, and INSTI's maker sold it on Amazon:

HIV.gov says self-tests may be covered by insurance, so ask your plan.

Free HIV self-tests

CDC says you can order free HIV self-tests through Together TakeMeHome, and HIV.gov adds that supplies are subject to availability. CDC's GetTested site shows organizations near you that offer free or reduced-cost self-tests.

Rapid HIV testing near you

CDC says most HIV tests are free or reduced cost, and that a community testing site will most likely give you a rapid test. CVS's MinuteClinic tests patients 18 and older for HIV, with results usually in 2 to 7 days, and lists PEP among its services.

Free option: public clinics

Free and low-cost testing is available at health department clinics and Title X family planning clinics. CDC's GetTested site finds confidential, free or low-cost testing near you by ZIP code.

What to expect

• Clinics usually test for chlamydia, gonorrhea, syphilis and HIV, and often hepatitis B and C, following CDC screening advice for your age, anatomy and the kind of sex you have.
• A clinician can examine you, swab sores and often treat you in the same visit.
• Some tests sold in private panels are usually not offered without symptoms, such as herpes blood tests and HPV tests for men, because CDC doesn't recommend them as screening tests.
• Hours can be limited, and you may wait for an appointment or a walk-in slot.
• Free testing usually isn't anonymous either (some publicly funded sites offer anonymous HIV testing). Positive results for reportable infections are reported to the health department, confidentially.

Find free testing near you (opens in a new tab)More about free testing

Our free testing guide explains what to expect.

How much does an HIV test cost?

Current prices for an HIV test across the providers we track:

Our HIV test page lists every offer, including lab tests and panels. With insurance, HIV.gov says the Affordable Care Act requires plans, including most Medicaid programs, to cover HIV screening without a copay. Our STD test cost guide has more on insurance.

Privacy: confidential, not anonymous

HIV is reportable in every state. Labs and health care providers report a confirmed diagnosis by name to the state or local health department, and CDC says those reports are confidential and reach CDC without personal identifiers. That includes lab tests you order online, and the follow-up test after a reactive self-test.

CDC has reported that in many states, publicly funded sites offer anonymous HIV testing, where you don't give your name. Ask when you call. Our privacy guide explains what ends up in your records.