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infectiousHas Critical Values
CD4+ T Cell Count
CD4· also: CD4 Count, T-cell count
Clinical Overview
CD4 count monitors immune function in HIV-positive patients. CD4 <200 cells/µL defines AIDS. Used to guide antiretroviral therapy initiation and prophylaxis decisions.
Reference RangesWHO/IFCC standards
| Age Group | Reference Range | Unit | Notes |
|---|---|---|---|
| Adults (18–64) | 500 – 1500 | cells/µL | Normal immune function |
| All ages | 200 – 499 | cells/µL | Moderate immunosuppression |
Also reported in: cells/mm³.
Critical (Panic) Values
Critical Low: < 200 cells/µL. Values outside these limits require immediate clinical attention.
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Related Topics
HIVAIDSimmunityCD4