You can get a simple blood test to see if you have been infected with HIV. The test looks for HIV antibodies in your blood. These antibodies are substances that the body makes in response to the HIV infection.
A small sample of your blood is drawn and sent to the laboratory for testing. If the first test shows signs of HIV (preliminary test), the sample will be tested again (confirmatory test). HIV infection is only confirmed after the sample of blood has been tested at least two times.