Absolute B Lymphocyte Count

**Semantic type:** Laboratory Procedure

**Definition:** The measurement of the number of B lymphocytes, which are leukocytes that express either CD19 or CD20, in a cubic millimeter of blood. It is calculated by multiplying 1000 by both the total leukocyte count and the percent of B-cells in the differential leukocyte count.

**Synonyms:** - Absolute B Cell Count - Absolute B-Cell Lymphocyte Count - Absolute BLYCE - B Lymphocyte to Total Leukocyte per Cubic Millimeter Measurement