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| CD4 Lymphocyte Count Lymphocyte Count, CD4 | T4 Lymphocyte Count | CD4 Cell Counts | CD4 Counts | CD4+ Cell Counts | CD4+ Counts | CD4 Cell Count | CD4 Count | CD4 Lymphocyte Counts | CD4+ Cell Count | CD4+ Count | Count, T4 Lymphocyte | Counts, T4 Lymphocyte A count of the number of CD4-positive lymphocytes in the blood. Determination requires the use of a fluorescence-activated flow cytometer. |