Hemoglobin A2 (HbA2) is a normal variant of hemoglobin A that consists of two alpha and two delta chains (α2δ2) and is found at low levels in normal human blood. Hemoglobin A2 may be increased in beta thalassemia or in people who are heterozygous for the beta thalassemia gene.
- "Clinical Practice Guideline for Sickle Cell Disease/Trait". American Society of Aerospace Medicine Specialists. Retrieved 3 May 2013.
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