An HIV test shows if someone is infected with HIV, the virus that attacks the body's immune system and causes acquired immune deficiency syndrome, or what is more commonly known as AIDS. There are several different tests that can be used to determine if you are carrying the HIV virus. The first test developed is still the most frequently used for the initial detection of HIV infection: the enzyme-linked immunosorbent assay or as it's more commonly known, the ELISA or EIA.
The ELISA is usually done by drawing blood, usually from a finger prick (for rapid tests) or taken from a vein in the arm (for standard tests). The process is no more uncomfortable than a typical blood test. For most people, it is not particularly painful and the blood draw is accomplished quickly.
If the ELISA test is negative—meaning that antibodies are not found—the testing is complete. If the ELISA test is positive, the laboratory will want to make sure that it is not a "false positive" result (some molecules in the bloodstream can sometimes cause a false-positive result). First, they may repeat the ELISA test. If it's positive, they will conduct a test called a Western blot. If both the ELISA and the Western blot test yield a positive result, a diagnosis of HIV infection is confirmed and the results are sent back to the healthcare professional who ordered the test.
If you have blood drawn for an HIV test, it can take between one and two weeks to confirm the results. If it seems as if you are waiting a long time to learn the results, this in no way means that the result is "positive" and that the laboratory needs more time to conduct additional tests.
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