NCIt definition : A condition characterized by the presence of a variant of normal hemoglobin (hemoglobin
D), which is caused by mutation(s) in the gene encoding the beta subunit of the hemoglobin
molecule.;
Alternative definition : NICHD: An autosomal recessive disorder resulting from the production of hemoglobin
D, secondary to various substitution mutations in the beta chain, and characterized
by mild hemolytic anemia and possible splenomegaly. Multiple subtypes of hemoglobin
D have been identified.;