Examine blood film to determine if there is abnormal prevalence of:
— Reactive lymphocytes, associated with infectious mononucleosis (see Chap. 53).
— Large granular lymphocytes, associated with large granular lymphocyte leukemia (see Chap. 58).
— Small lymphocytes and smudge cells, associated with chronic lymphocytic leukemia (CLL) (see Chap. 56).
— Small cleaved lymphocytes, associated with low- or intermediate-grade lymphomas (see Chap. 62).
— Blasts, associated with acute lymphocytic leukemia (see Chap. 55).