What tests can detect AIDS

AIDS is usually diagnosed through HIV antibody testing, HIV antigen antibody joint testing, HIV nucleic acid testing and other tests. These testing methods can effectively determine whether one is infected with the human immunodeficiency virus (HIV), and it is recommended that individuals with high-risk behaviors or suspected symptoms seek medical attention and screening in a timely manner.

1. HIV antibody testing:

This is the most commonly used initial screening method, which determines infection by detecting HIV specific antibodies in the blood. Usually, antibodies can only be detected 3-6 weeks after infection, which is called the window period. If the initial screening result is positive, further confirmatory tests such as immunoblotting are needed to confirm. It is not necessary to fast before testing, but it is important to avoid testing during the window period to avoid false negative results.

2. HIV antigen antibody combination test:

This test can simultaneously detect the p24 antigen and antibody of HIV, which can shorten the window period to 2-4 weeks compared to simple antibody testing. The p24 antigen can appear 2-3 weeks after infection, so combined testing can detect infection earlier. This method is also performed through blood sampling and is suitable for early screening after high-risk behaviors. If the result is positive, a confirmatory test is still required.

3. HIV nucleic acid testing:

nucleic acid testing directly detects HIV virus RNA in the blood, with the shortest window period, usually detected 10-14 days after infection. This method has high sensitivity and is commonly used for early diagnosis, confirmation of acute phase infections, and diagnosis of infections in infants and young children. However, due to the high cost, it is generally not used as a routine screening method and is mostly used for supplementary diagnosis in cases where antibody test results are uncertain or in special circumstances.

4. CD4+T lymphocyte count:

This test is not used to diagnose AIDS, but to assess the extent of immune system damage of infected people. By detecting the number of CD4+T lymphocytes in the blood, it is possible to determine the stage of disease progression and whether antiviral therapy needs to be initiated. The CD4+T cell count of normal adults is usually 500-1600 cells/microliter. When the number drops below 200 cells/microliter, it indicates that AIDS has entered the stage.

5. Virus load detection:

Virus load detection is the quantitative detection of the level of HIVRNA in the blood, used to monitor the effectiveness of antiviral therapy and disease progression. The test results are expressed in copy number per milliliter, and the higher the viral load, the stronger the infectivity. During antiviral therapy, regular testing of viral load can evaluate the effectiveness of the drug. If the viral load continues to be undetectable, it indicates that the treatment effect is good.

When conducting AIDS related examinations, it is recommended to go to a regular medical institution or CDC, and no special preparation is required before testing. Pay attention to safe sexual behavior in daily life, avoid sharing needles, and if diagnosed with infection, initiate antiviral treatment as soon as possible and follow up regularly. Maintaining a positive attitude and actively cooperating with doctors for treatment can effectively control the progression of the disease and improve the quality of life.