HIV 4th Generation Antigen/Antibody Test
HIV 4th Generation Antigen/Antibody Test can be requested without a referral, and this overview covers what to expect. The HIV 4th generation antigen/antibody test is a blood test that looks for signs of HIV infection. It detects both a viral protein (the p24 antigen) and antibodies the body makes against HIV. It is ordered to screen for HIV or to check after a possible exposure.
- Sample type
- blood
- Category
- Sexual Health
- Turnaround
- 1-3 business days
- Price
- $49
- Referral
- Not required
The HIV 4th generation antigen/antibody test is a blood test that looks for signs of HIV infection. It detects both a viral protein (the p24 antigen) and antibodies the body makes against HIV. It is ordered to screen for HIV or to check after a possible exposure.
What it measures
- HIV-1/2 antibodies — Proteins your immune system makes in response to HIV.
- p24 antigen — A piece of the virus that can appear earlier than antibodies.
- HIV-1 and HIV-2 — The test screens for both main types of the virus.
Who it is for
A healthcare professional may order this test for routine screening, during pregnancy, or after a possible exposure. It is also used when someone has symptoms that could be related to HIV.
Preparation
No fasting or special preparation is needed. Tell your clinician about any recent possible exposure, because timing can affect when the test is most useful.
Results and what they mean
Results are usually reported as nonreactive (negative) or reactive (positive), sometimes with a numeric value. A reactive result needs follow-up testing to confirm it. Only a clinician can interpret your results in context. This is general information, not medical advice.
How to order this test
- Choose the test and place a confidential order online.
- Select a certified collection site and pick a time that suits you.
- Have your specimen collected — most draws take only a few minutes.
- Review results in a secure portal, typically within 1–3 days.
Preparation, hours, and pricing vary by site; confirm details directly with the lab before your visit.
Availability by state
Direct-access online ordering for the hiv 4th generation antigen/antibody test is available in most states. It is currently unavailable in 6 states:
Everywhere else you can order confidentially and collect your sample at a certified site. Browse by state →
Frequently asked questions
How soon after exposure can this test detect HIV?
It can often detect infection earlier than older antibody-only tests, but no test is positive right away. Ask your clinician when to test based on your situation.
What does a reactive result mean?
It means the test found a possible sign of HIV and follow-up testing is needed. A reactive screening result is not a diagnosis by itself.
Can I get this test without symptoms?
Yes. It is commonly used for routine screening even when a person feels well.
Is the test painful?
It uses a standard blood draw, which most people feel as a brief pinch.