hemoglobin A2(redirected from Haemoglobin a2)
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the normal Hb (Hb A2) of the formula α2Aδ2 or α2δ2, which makes up approximately 2.5% of the total adult hemoglobin concentration. At least 18 mutant variants of the δ chain have been reported.
hemoglobin A2 (Hb A2)
a normal hemoglobin present in small amounts in adults, characterized by the substitution of delta chains for beta chains. Its concentration in the blood increases in various hematologic diseases. It normally constitutes 1.5% to 3.5% of the total hemoglobin.