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Homozygous hemoglobin Abruzzo in a North American child.

Hemoglobin Abruzzo is a stable hemoglobin variant with increased oxygen affinity, clinically causing compensatory erythrocytosis in affected patients. Heterozygosity of this variant with or without beta-thalassemia has been previously described in three Italian families, thereby suggesting a single origin of the mutation. The authors report the first case of homozygosity in a North American female infant, born to heterozygous parents as a product of consanguineous marriage.