A member asked:

According to who, 6 weeks hiv test is conclusive (unless i miss understood it) then why cdc recommends 3 to 6 months for conclusive results?

A doctor has provided 1 answer
Dr. Dominic Riganotti answered

Specializes in Infectious Disease

The "Window Period": Window period is the time it takes lymphocytes to develop antibodies to an antigen. This is usually 4-6 weeks but can be as long as 3 months. By 3 months after exposure...97% of people will have antibodies to antigen. In rarer instances it may take up to 6 months to develop antibodies. After 6 months..99% of people exposed will have antibodies to viral antigens. Therefore the 3 to 6 months!!!

Answered 7/7/2017

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