Q. Please explain the accuracy of HIV Ag/Ab test at 40th day after exposure.

Answered by
Dr. Kakkar
and medically reviewed by Nithila A
Published on May 26, 2019

Hello doctor,

How accurate is the HIV Ag/Ab test at 40th day after exposure? I know I should retest after three months, but could the symptoms show up, and the antibody is still hidden? Please give me an explanation.

Dr. Kakkar

Dermatology HIV/AIDS Specialist Venereology
#

Hello,

Welcome to icliniq.com.

The window period of the Ag/Ab test varies from 18 to 45 days. Therefore a negative test at six weeks (42 days) would be considered conclusive in 98-99 % individuals. However, a negative test at 12 weeks is still considered the golden standard (conclusive in 99.9 % of individuals). CDC (centers for disease control) recommends that a negative Ag/Ab test at six weeks is good enough to rule out HIV. Take care.

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