*Tests and diagnosis*

HIV is most commonly diagnosed by testing your blood or saliva for antibodies to the virus. Unfortunately, it takes time for your body to develop these antibodies — usually up to 12 weeks. A newer type of test that checks for HIV antigen, a protein produced by the virus immediately after infection, can quickly confirm a diagnosis soon after infection. An earlier diagnosis may prompt people to take extra precautions to prevent transmission of the virus to others.

*Home test*

A Food and Drug Administration-approved home test is available. To do the test, you swab fluid from your upper and lower gums. If the test is positive, you need to see your doctor to confirm the diagnosis and discuss your treatment options. If the test is negative, it needs to be repeated in three months to confirm the results.