Hemoglobin A2

**Definition:** An adult hemoglobin component normally present in hemolysates from human erythrocytes in concentrations of about 3%. The hemoglobin is composed of two alpha chains and two delta chains. The percentage of HbA2 varies in some hematologic disorders, but is about double in beta-thalassemia.

**Tree numbers:** - D12.776.124.400.405.450 - D12.776.422.316.762.380.450