A negative, or non-reactive, HIV test result means that the test did not detect the HIV markers it is designed to detect in the sample tested.
However, a non-reactive result does not always rule out HIV infection. If testing was performed during the window period following a recent possible exposure, there may not yet be enough HIV antigen or antibodies for the test to detect.
The window period depends on the type of HIV test used. If you tested after a possible exposure and received a non-reactive result, repeat testing may be necessary after the window period for that specific test.
If you test again after the applicable window period, have had no new possible HIV exposure during that time, and the result is negative, the CDC states that you do not have HIV.
You can read more about test timing and the different window periods on our When to test for HIV? page.
For additional information about negative HIV test results, see the CDC guidance on HIV testing.
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