PREVALENCE OF HEMOGLOBIN-VARIANTS IN A DIABETIC POPULATION AND THEIR EFFECT ON GLYCATED HEMOGLOBIN MEASUREMENT

The measurement of glycated haemoglobin (glycated Hb) by automated high pressure liquid chromatography enabled the prevalence of haemoglobin variants (Hb variant) to be determined in a large diabetic population within Leeds, UK. There were 16 patients showing a Hb variant amongst a total of 5300 diabetics, the majority of the variants being HbA/S traits. There were also 13 patients showing a slightly raised HbF in the range of 2% to 5%. A multi-centre study was carried out by distributing blood specimens from some of the patients with Hb traits. Significant differences in the percentage of glycated Hb were observed relating to the methodology used. However, glycated Hb is used to monitor glycaemic control and laboratories must be aware of Hb variant interferences on their methods. Also, screening for Hb variants should be considered for the at risk groups of diabetic patients.