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The CD4 T-cell count is not an HIV test, but rather a procedure where the number of CD4 T-cells in the blood is determined. A CD4 count does not check for the presence of HIV. It is used to monitor immune system function in HIV-positive people. Declining CD4 T-cell counts are considered to be a marker of progression of HIV infection.
Detection of p24 protein's antigen can be used to identify the presence of HIV in a person's blood and diagnose HIV/AIDS, however, more modern tests have taken their place. [3] After approximately 50 days of infection, the p24 antigen is often cleared from the bloodstream entirely.
HIV rapid test being administered Oraquick HIV test. Most people infected with HIV develop seroconverted (antigen-specific) antibodies within three to twelve weeks after the initial infection. [32] Diagnosis of primary HIV before seroconversion is done by measuring HIV-RNA or p24 antigen. [32]
The latest recommendations of the US Centers for Disease Control and Prevention (CDC) show that HIV testing must start with an immunoassay combination test for HIV-1 and HIV-2 antibodies and p24 antigen. A negative result rules out HIV exposure, while a positive one must be followed by an HIV-1/2 antibody differentiation immunoassay to detect ...
(This is the interim African Region version for persons aged 15 years or more who have had a positive HIV antibody test or other laboratory evidence of HIV infection) (The United Nations defines adolescents as persons aged 10−19 years but for surveillance purposes, the category of adults and adolescents comprises people aged 15 years and over)
Standard anti-HIV IgG antibody tests cannot be used to reliably indicate a child's infection status before 18 months of age, so viral antigen tests are used. In the new system, HIV-infected children are classified into mutually exclusive categories according to three parameters: a) infection status b) clinical status c) immunologic status
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