Peripheral blood leucocytes in thyrotoxicosis (Graves' disease) as studied by conventional light microscopy

Peripheral blood leucocyte counts in 104 thyrotoxic (Graves' disease) patients were compared with those in 107 normal subjects of similar age and sex. The thyrotoxic patients had a significant leucopenia with an absolute and relative neutropenia. They also had a relative lymphocytosis but the absolute lymphocyte count was within normal limits. The relative and absolute monocyte counts were normal.