A form of beta thalassemia characterized by decreased or absent synthesis of both the delta- and beta-globin chains, which leads to a compensatory increase in fetal gamma-chain synthesis. this disorder results in a microcytic anemia that is clinically mild.

Delta-beta thalassemia is a rare form of thalassemia in which there is a reduced production of hemoglobin subunit delta and hemoglobin subunit beta and raised levels of hemoglobin subunit gamma. It is an autosomal recessive disorder..