Hemoglobin Alpha Homozygous Null Genotype

**Semantic type:** Laboratory or Test Result

**Definition:** A genetic finding indicating that neither copy of chromosome 16 has any functional copies of the hemoglobin alpha (HBA) genes. This genotype is associated with hemoglobin Barts.

**Synonyms:** - (--/--) - --/-- - HBA Homozygous Null Genotype - HBA Null Genotype - Hemoglobin Alpha Null Genotype - alpha-globin genotype (- - / - - )