The window period of HIV is the period of time between the time the HIV virus invades the body and when antibodies to the virus can be detected in the blood. The window period for HIV is approximately 14-42 days, and the exact length of time depends on the individual’s body type and response to the virus. With the continuous development of medical technology and testing methods, the window period of AIDS has been shortened, such as the enzyme-linked immunosorbent and quad generation reagents, which are more frequently used in recent years, can detect the early antigen of HIV and AIDS antibody at the same time, and these methods can detect the result in 2-6 weeks, so that the window period is greatly shortened. If these tests are negative, HIV infection can be largely ruled out. During the window period, some patients may have systemic symptoms such as diarrhea, vomiting, high fever, swollen lymph nodes, skin rashes, muscle aches, chills and night sweats, etc. The symptoms are irregular and mild, and are often ignored, and then enter a long asymptomatic incubation period. It should be noted that the doctor may also cooperate with some epidemiological examination or physical examination during the test to ensure that the test results are more comprehensive and accurate and reliable. After the diagnosis is confirmed, the patient should actively cooperate with the doctor’s treatment, take the medication on time and follow up regularly to avoid more serious complications and more serious damage to the patient’s health.