Diagnosis of concurrent hemoglobin H disease and heterozygous beta-thalassemia.

Definitive diagnosis of concurrent hemoglobin (Hb) H disease and heterozygous beta-thalassemia cannot be made from Hb analysis alone, but necessitates genotype analysis and family study. Interactions between alpha- and beta-thalassemia must be considered when investigating moderate to severe hypochromic microcytic anemia of uncertain cause in adult patients from areas with a high prevalence of globin gene mutations.