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A 22-year-old male asked:

Elisa p24 antigen 1.56(s/co) positive, antibody negative@25 days after exposure. rna pcr tnd(target not detected) @25days. elisa p24 ag 0.92(s/co) (gray zone)@27 days. roche eclia hiv ag/ab combo test negative @30 and 35 days. am i infected or not?

1 doctor answer2 doctors weighed in
Dr. Hunter Handsfield
Infectious Disease 55 years experience
Almost certainly you had a false-positive intial p24 antigen test, which later was negative, as shown by the negative AgAb tests at 30 and 35 days. You do not have HIV. However, it can take up to 45 days for AgAb tests to become positive. Have another AgAb test 45+ days after exposure.
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Last updated Dec 24, 2022


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