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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 ...
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.
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 ...
In 1993, the CDC added pulmonary tuberculosis, recurrent pneumonia and invasive cervical cancer [2] to the list of clinical conditions in the AIDS surveillance case definition published in 1987 [3] and expanded the AIDS surveillance case definition to include all HIV-infected persons with CD4+ T-lymphocyte counts of fewer than 200 cells/μL or ...
A CD4 count of less than 200/μL [30] The U.S. Centers for Disease Control and Prevention also created a classification system for HIV, and updated it in 2008 and 2014. [115] [116] This system classifies HIV infections based on CD4 count and clinical symptoms, and describes the infection in five groups. [116]
HIV-infected children less than 12 years of age also develop disseminated MAC. Some age adjustment is necessary when clinicians interpret CD4+ T-lymphocyte counts in children less than 2 years of age. Diagnosis, therapy, and prophylaxis should follow recommendations similar to those for adolescents and adults. [14]
CD4 counts should rise 50 to 100 cells per ml in the first year of therapy. [56] There can be substantial fluctuation in CD4 counts of up to 25% based on the time of day or concomitant infections. [95] In one long-term study, the majority of increase in CD4 cell counts was in the first two years after starting ART with little increase afterwards.
Viral load testing provides more information about the efficacy for therapy than CD4 counts. [22] For the first 2 years of HIV therapy, CD4 counts may be done every 3–6 months. [22] If a patient's viral load becomes undetectable after 2 years then CD4 counts might not be needed if they are consistently above 500/mm 3. [22]