After exposure to HIV, it can take 3 to 12 weeks (21-84 days) for an infected person’s body to make enough antibodies for a screening test to detect them. This is called the window period. IgM is typically released around 3 weeks after infection which is one of the antibodies the INSTI Test is designed to detect. An individual may test positive with the INSTI Test in as little as 21-22 days after infection, however it can take as long as 3 months to produce a positive result. Approximately 97% of people will develop detectable antibodies during this window period. A negative result may not be accurate until 3 months after after a possible exposure. If someone has been exposed to HIV and obtains a negative test result during the window period, they should re-test 3 months after possible exposure to HIV.