Authors' reply

BMJ 1995; 310 doi: https://doi.org/10.1136/bmj.310.6981.741 (Published 18 March 1995) Cite this as: BMJ 1995;310:741
  1. Eric S Kilpatrick,
  2. Alan G Rumley,
  3. Marek H Dominiczak,
  4. Michael Small
  1. Career registrar Principal biochemist Consultant biochemist Consultant physician Department of Pathological Biochemistry, Gartnavel General Hospital, Glasgow G12 0YN

    EDITOR,—Susan Standing and Richard Taylor suggest that use of a fixed biological variation to express SD may help in the comparison of methods of measuring haemoglobin A1 (HbA1) that have different imprecisions. This may be simplified further as the imprecision of the assay affects only the spread of results: it does not affect either the mean glycated haemoglobin concentration in a reference population or the median value in a diabetic …

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