A high level of hemoglobin A2 is around 12% of hemoglobin present. Levels 15% or higher should be investigated and repeated.
Causes of a hemoglobin A2 level >= 15%:
(1) laboratory error
(2) heterozygous hemoglobin C with alpha thalassemia and/or iron deficiency
(3) heterozygous hemoglobin E with alpha thalassemia and/or iron deficiency
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Specialty: Hematology Oncology, Clinical Laboratory