There are 3 types of HIV tests.
Nucleic Acid Test (NAT)
This test uses a sample of your blood to count the amount of the virus in your blood. A NAT can tell you if you have HIV as soon as 10 to 30 days after you came in contact with the virus. This test costs the most of all HIV tests, so it isn’t done often.
Antigen/Antibody Test
This test uses a sample of your blood to look for HIV antibodies and antigens. Antibodies are what your body makes to fight off anything that makes you sick. An antigen is another name for anything that makes you sick. The antigen/antibody test can tell you if you have HIV as soon as 18 to 45 days after you came in contact with the virus. This test is very common in the United States.
Antibody Test
This test uses a sample of your blood to look for HIV antibodies. Your body makes antibodies to fight off anything it thinks will make you sick. The antibody test can tell you if you have HIV as soon as 23 to 90 days after you came in contact with the virus. Most rapid HIV tests and HIV home collection kits you can do at home are antibody tests. To examples of antibody tests are:
1. Rapid HIV Test:These tests can tell you if you have HIV in under 30 minutes. You can use a sample of your blood or spit for this test.
2. HIV Home Collection Kit: You can buy these tests at a drug store or online. You would first prick your finger to draw blood. Then, you would mail your blood sample to the kit’s laboratory. You can call as soon as the next day to find out if the test was positive or negative.
If an antibody test says you’re positive, you will need to take another test to make sure the first test was right.
If any HIV test says you’re negative, you might have to get tested against to make sure the first test was right. This is because of the HIV tests have a window period. The window period is the time between when you have contact with HIV and the time a test can tell if you have HIV. If you take an HIV test during a window period, the test might think you don’t have HIV even if you do.