how long is window period for hiv infection
The window period is the time from infection until a test can detect any change. The average window period with HIV-1 antibody tests is 25 days for subtype B. Antigen testing cuts the window period to approximately 16 days and NAT (Nucleic Acid Testing) further reduces this period to 12 days.ntibody tests may give false negative (no antibodies were detected despite the presence of HIV) results during the window period, an interval of three weeks to six months between the time of HIV infection and the production of measurable antibodies to HIV seroconversion.
During the window period a person can be infected with HIV and infectious but have a negative HIV test. The window period for a 4th generation antigen/antibody test is four weeks.At this time this test will detect 95% of infections (see Figure 7). After a three month window period after exposure, the confirmatory test will detect more than 99.97% of infections.he window period for a 4th generation antigen/antibody test is four weeks. At this time this test will detect 95% of infections (see Figure 7).