haemoglobin A2medical dictionary


An adult haemoglobin component normally present in haemolysates from human erythrocytes in concentrations of about 3%. The haemoglobin is composed of two alpha chains and two delta chains. The percentage of hba2 varies in some haematologic disorders, but is about double in beta-thalassaemia.

Chemical name: Haemoglobin A2

American spelling: hemoglobin A2

(12 Dec 1998)