The HIV nucleic acid test is a direct test of the RNA or DNA structure of HIV to detect the presence of nucleic acids of the virus in the blood to determine if there is an infection with the pathogen. This method is highly sensitive and can increase the specificity of the test and reduce the probability of false positives. Nucleic acid testing can shorten the window period of HIV to 11 days, so that HIV infection can be detected as early as possible, so that early diagnosis and early treatment can be made, which is conducive to delaying the development of the disease and improving the quality of life. It also helps to protect others from infection and helps to control AIDS.