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A 52-year-old man presented for an evaluation of worsening glycemic control secondary to glucocorticoid administration. The glycated hemoglobin (HbA1c) level was 8%, and oral glucose tolerance testing revealed impaired tolerance, whereas the plasma glucose and glycoalbumin levels were normal. The results of high-performance liquid chromatography (HPLC) for HbA1c, isoelectrofocusing of the hemolysate and precise HPLC measurements of the HbA1c level supported the presence of an Hb variant, and DNA sequencing of the β-globin gene revealed Hb Yahata [β112 TGT (Cys)→TAT (Tyr)] (heterozygote). In this case, the discrepancy between the plasma glucose and HbA1c levels raised suspicion of this rare Hb variant.

A Rare Case of Variant Hemoglobin (Hb Yahata) Suspected Based on Inconsistent Plasma Glucose and HbA1c Levels