Testing for HIV during the window period may result in false negatives because the markers may not be produced in the body during the window period, so there may be errors in testing for HIV infection through these markers, so testing for HIV should avoid the window period. For example, HIV-RNA testing can detect the virus in the patient’s blood about 7-10 days after HIV infection. For example, HIV-RNA testing can detect the virus in the patient’s blood about 7-10 days after HIV infection, while HIV antigen and antibody testing can detect the virus in the patient’s blood about 2-3 weeks after HIV infection. For HIV antibody testing alone, antibodies can be detected in the blood only about 3-4 weeks after HIV infection.