HIV negative: understanding the result
Explanation
An HIV-negative result means the test did not detect the signs of HIV infection it looks for. A recent infection can still be missed, so the test type and timing matter.
Why timing matters
No HIV test can detect infection immediately. The time until a test can reliably detect it is called the window period. Different tests have different window periods.
Ask the testing service which test was used and whether another test is needed after a possible recent exposure. A negative result also does not protect against a later infection.
Do all HIV tests look for the virus?
Some tests look for antibodies, proteins the immune system makes in response to HIV. Others also look for a protein from the virus, or look for its genetic material. The words “HIV negative” alone do not identify the method.
If exposure may have been very recent
If a possible exposure was within the past 72 hours, seek urgent medical advice about PEP. This is medicine that can help prevent HIV after exposure. It works best when started as soon as possible. Do not wait for a later test before seeking advice.
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