In this issue of Diabetes Care, Koskinen et al. report that fetal hemoglobin levels are increased in diabetic patients (this issue, L.K. Koskinen et al., p. 828–831). The study design was a cross-sectional one with glycohemoglobin and fetal hemoglobin determinations for 930 diabetic and 258 control subjects. The authors found thatalmost 7% of the diabetic subjects had fetal hemoglobin levels >1% compared with only∼2% of the control subjects. Furthermore, fetal hemoglobin levels were increased moreoften in those with IDDM than in those with NIDDM.

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