What if someone tests negative during the window period?

If a person tests negative for HIV during the four week to three month window period, the negative result still cannot be considered confirmatory or accurate. During the window period, a negative test may result because the body has not produced enough HIV antibodies to be measured by a standard HIV blood test. Only after the window period of three months has passed, and providing the individual has not continued to engage in unprotected risk activities during the window period, should negative HIV test results be considered accurate.