We have devised a rapid and convenient method of eliminating the contribution of labile glycosylated hemoglobin in the hemoglobin A, assay. The procedure requires a 30-min incubation of erythrocytes in 30 mM semicarbazide and 12 mM aniline (pH 5, 38°C). This chemical means of eliminating the labile fraction is as effective as a 14-h incubation in isotonic saline as measured with high-pressure liquid chromatography or electrophoresis methods. The removal of the labile glycosylated hemoglobin fraction preserves the assay as a reliable index of chronic metabolic control.

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