Absolute CD4

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The absolute CD4 count is a measurement of how many functional CD4 T-cells are circulating in the blood. The lower the absolute CD4 count, the weaker the immune system. The absolute CD4 count is measured by a simple blood test and is reported as the number of CD4 cells per cubic millimetre of blood. HIV-negative people typically have absolute CD4 counts between 600 and 1200 CD4 cells per cubic millimetre. HIV-infected people have counts that are typically less than 500, and people with AIDS can have 200 CD4 cells per cubic millimetre or fewer.

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