Differential leukocyte count. Identification and function of normal and abnormal leukocytes and erythrocytes. Absolute values and indices. Anaemia: general aspects and investigation. Iron-deficiency anaemia, megaloblastic anaemia, haemolytic anaemia. Aplastic, siderocytic and sideroblastic anaemia. Polycythaemia. Haematological malignancies: including leukaemias. Blood cells cytochemistry and techniques. Haemostasis and thrombosis. Investigation of the haemostatic mechanism. Laboratory control of anticoagulant therapy. Use of radionuclides in haematology. Haemoglobinopathies and thalassaemias and their investigation.