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A member asked:
Hi dr. is the hiv combo test considered conclusive after 28 days? thank you
A doctor has provided 1 answer
Yes: The HIV antigen-antibody ("combo", "duo", "4th generation") test is conclusve any time 4 weeks or more after the last possible exposure. Some agencies take conservative stances and still advise later testing, e.g. 3 months, but it is rarely necessary. There might be an exception if someone gets post exposure prophylaxis (PEP) with anti-HIV drugs. Unsuccessful PEP might delay positive to 3 mo.
Answered 10/4/2018
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