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San Jose, CA
A 33-year-old male asked:

What is the window period for an hiv 4th generation test and when it can be considered conclusive?

1 doctor answer2 doctors weighed in
Dr. Hunter Handsfield
Infectious Disease 53 years experience
4-6 weeks: Almost all (~98%) of people with new HIV infections have positive HIV antigen-antibody (AgAb, "duo", 4th generation) tests by 4 weeks, and a negative result at that time is very reassuring. But on rare occasions it takes up to 45 days (6 weeks). Although official guidelines from many agencies still suggest waiting 3 months, most experts agree that advice is outdatted and 6 weeks is conclusive.

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Last updated Feb 11, 2021

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