No HIV test can detect HIV immediately after infection. If you think you’ve been exposed to HIV in the last 72 hours, talk to your health care provider about post-exposure prophylaxis (PEP), right away. The time between when a person may have been exposed to HIV and when a test can tell for sure whether they have HIV is called the window period. Our testing technology has a 6 week window period for HIV.  The window period refers to the number of weeks required for the human body to develop antibodies to after infection. During the window period a person may test negative even if they are carrying the virus.