<prompt> Which of the following is the finding in lymphoid tissues in individual with common variable hypogammaglobulinemiaDecreased B cell countIncreased B cells countNormal B cell countAbsent B cells  <response>: Ref Robbins 8e p233,9e p241 Making a definitive diagnosis of primary hypogammaglobulinemia There is no single diagnostic test; CVID is a diagnosis of exclusion. Laboratory testing shows hypogammaglobulinemia low IgG plus either low IgA or IgM, or both and low specific antimicrobial antibody responses despite immunization. 