Alpha thalassemia SEA deletion heterozygous means alpha thalassemia Southeast Asian deletion heterozygous. 1. At least 81 mutant types of α-thalassemia have been identified, including point mutations and gene mutations. 2. α Thalassemia Southeast Asian deletion heterozygous, is the Southeast Asian deletion in the deletion mutation in the gene mutation type of α Thalassemia, which is the more common type of α Thalassemia in China. 3. α thalassemia Southeast Asian deletion heterozygous individuals often have no clinical symptoms, normal hemoglobin or mild anemia, average red blood cell volume and average red blood cell hemoglobin amount is reduced. When heterozygous for α-thalassemia Southeast Asian deletion, the individual should be seen in a hospital and counseled and treated.