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The 4th generation HIV test covers HIV-1 and HIV-2. We do not see other subtypes of HIV, and we would consider a negative test at 12 weeks to be conclusive.
If you have had a negative HIV test at 12 weeks after a possible exposure we would say that you are negative, even if you are having symptoms.
The typical symptoms for HIV sero-conversion are very general, and can be caused by many different things (for ex: flu-like symptoms are most often caused by cold/flu, nausea can be caused by stress etc.). If you are having persistent symptoms we would recommend talking to a health care provider in person.
It’s common for people to worry after having a possible exposure to HIV. Check out our Worry and Anxiety page for some helpful ideas.
Please let us know if you need any additional information.
This answer was posted on April 23, 2018