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  2. Diagnosis of HIV/AIDS - Wikipedia

    en.wikipedia.org/wiki/Diagnosis_of_HIV/AIDS

    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.

  3. CD4 - Wikipedia

    en.wikipedia.org/wiki/CD4

    Medical professionals refer to the CD4 count to decide when to begin treatment during HIV infection, although recent medical guidelines have changed to recommend treatment at all CD4 counts as soon as HIV is diagnosed. A CD4 count measures the number of T cells expressing CD4. While CD4 counts are not a direct HIV test—e.g. they do not check ...

  4. CDC classification system for HIV infection - Wikipedia

    en.wikipedia.org/wiki/CDC_Classification_System...

    In 1993, the CDC added pulmonary tuberculosis, recurrent pneumonia, and invasive cervical cancer to the list of clinical conditions in the AIDS surveillance case definition published in 1987 and expanded the AIDS surveillance case definition to include all HIV-infected persons with CD4+ T-lymphocyte counts of less than 200 cells/uL or a CD4 ...

  5. Viral load monitoring for HIV - Wikipedia

    en.wikipedia.org/wiki/Viral_load_monitoring_for_HIV

    CD4 testing shows the strength of the immune system, but does not report viral activity. As established by the Centers for Disease Control and Prevention (CDC), a person with HIV and a CD4 count below 200 or a CD4 percentage below 14% is considered to have AIDS. [5] An increased CD4 count can result from an immune response to an infection or a ...

  6. T helper cell - Wikipedia

    en.wikipedia.org/wiki/T_helper_cell

    The depletion of CD4 T cells and the development of chronic inflammation are signature processes in HIV pathogenesis that propel progression to acquired immune deficiency syndrome (AIDS). CD4 T cell depleted to the cell count of less than 200cell/μL in blood during AIDS allows various pathogens to escape T cell recognition, thus allowing ...

  7. HIV/AIDS - Wikipedia

    en.wikipedia.org/wiki/HIV/AIDS

    Stage 2: CD4 count 200 to 500 cells/μL and no AIDS-defining conditions; Stage 3: CD4 count ≤ 200 cells/μL or AIDS-defining conditions; Unknown: if insufficient information is available to make any of the above classifications. For surveillance purposes, the AIDS diagnosis still stands even if, after treatment, the CD4 + T cell count rises ...

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