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Three hundred and twenty eight serial measurements of blood glucose (SMBG) performed in a Department of Medicine were rated by 7 experienced diabetes specialists. A statistical study showed considerable variation among the raters. Similarly, the ratings of the 7 physicians relative to the mean rating showed a great deal of individual variation. A highly satisfactory correlation was found between the mean rating of the 7 physicians and the M-value of Schlichtkrull as computed from 7 or 8 samples collected during the day. On the basis of these findings the degree of diabetes control for this population can be judged satisfactory, good or very good when the M-value is ⩽ 10. If the M-value is ⩾ 22, control is poor or very poor and major changes in the treatment program are indicated. Intermediate values, seen in one out of five cases, indicate the need for systematic consultation with a diabetes specialist. [ABSTRACT FROM AUTHOR]