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| Subject | English | Thesaurus |
| med. | CD4 cell percentage | Percentage of white blood cells that are CD4 T lymphocytes (CD4 cells). In certain cases, such as during acute HIV infection or HIV infection in children younger than 5 years of age, CD4 percentage is used rather than CD4 count to assess HIV progression or response to antiretroviral therapy (ART). |
| abbr., IT | Cell Directory Services | CDS |
| telecom., abbr. | Cell Level Atm Services Simulator | CLASS |