alpha thalassemia
thalassemia involving the hemoglobin genes HBA1 and HBA2
hemoglobin H disease
alpha thalassemia that has material basis in contiguous gene deletion of the hemoglobin alpha-1 (HBA1) and alpha-2 (HBA2) genes on one chromosome 16, and a defect, deletional or nondeletional, in either HBA1 or HBA2 on the other