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doi:10.1136/bmj.309.6967.1512

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Eric S Kilpatrick,
Alan G Rumley,
Marek H Dominiczak,
Michael Small

Career registrar Principal biochemist Consultant biochemist Department of Pathological Biochemistry, Gartnavel General Hospital, Glasgow G12 0YN Consultant physician Diabetic Unit, Gartnavel General Hospital.

EDITOR,—A S Wierzbicki and colleagues think that trends in glycated haemoglobin concentration should be used with little referral to their absolute value. Accordingly, they must think that a patient with a stable haemoglobin A1c concentration of 12% should be treated in a similar manner to one with a stable value of 6%. In the light of the diabetes control and complications trial, which showed an impressive reduction in microvascular complications with improved absolute glycated haemoglobin values,1 …