The three-month HIV test is not completely accurate. It should not be used as the final determination in whether or not an individual has been infected with HIV, according to WebMD.
It takes up to six months for the HIV virus to produce antibodies that are detected with the HIV test, states WebMD. Because of this, testing is suggested at intervals of six weeks, three months and six months after someone has been exposed to the virus. Even if a person tests negative at three months, he may be able to spread HIV. It is crucial that an individual who has been exposed to the virus use all necessary precautions until he has been cleared by a six-month HIV test.