has part has part characteristic of inheres in has modifier B cell Decreased total B cell count 2011-02-06T09:44:11Z HP:0002956 HP:0002856 UMLS:C1855067 Low B cell count Plasma B cells differentiate from B cells and secrete large amounts of antibodies. HP:0005365 The absolute number of B cells in the blood, per microlitre is below the lower limit of normal of the reference range for the appropriate sex and age-group. B lymphocytopenia HP:0030251 Decreased B cell count Reduction in B cell number B cell lymphopenia HP:0010976 CD19 lymphocytes low B cell deficiency Abnormal total B cell count abnormal decreased amount