A negative self-test on HIV test strips cannot be ruled out. HIV test results are not necessarily accurate and cannot be relied upon to confirm or rule out HIV. A negative HIV test result generally indicates that the chance of contracting HIV is not high, but it does not rule it out completely. The period between HIV infection and the appearance of AIDS antibodies in the blood is called the window period, and there are individual differences, with a general upper limit of 3 months. In order to rule out HIV infection, it is recommended to go to a regular hospital for a blood test. The test should be conducted 1 month, 3 months and 6 months after the risky behavior. If the blood test is negative, HIV infection can be ruled out.