Absolute Helper T Lymphocyte Count

**Semantic type:** Laboratory Procedure

**Definition:** The measurement of the number of helper T lymphocytes, which are T lymphocytes that express CD4, in a cubic millimeter of blood. It is calculated by multiplying 1000 by both the total leukocyte count and the percent of helper T cells in the differential leukocyte count.

**Synonyms:** - Absolute CD4 Expressing T Cell Count - Absolute CD4 Expressing T Lymphocyte Count - Absolute CD4 Positive T Cell Count - Absolute CD4+ T Cell Count - Absolute CD4+ T Cells - Absolute Helper T Cell Count - CD4 Positive T Lymphocyte to Total Leukocyte per Cubic Millimeter Measurement - Helper T Lymphocyte to Total Leukocyte per Cubic Millimeter Measurement