Abnormal granulocyte morphology Abnormal leukocyte count Abnormal granulocyte count 2019-02-14T10:54:57Z Abnormal increase or decrease of absolute number of granulocytes in the blood, per microliter, compared to a reference range for a given sex and age-group. Granulocytes belong to the innate immune system and make up the largest proportion of white blood cells. They are myeloid cells and can be classified as neutrophil granulocytes (neutrophils), eosinophils, basophils, monocytes, and mast cells.