1. The determination of urinary sugar and acetone by ward nursing service personnel is often inaccurate. In 12 per cent of the tests reported in this study the level of inaccuracy could lead to significant errors in management.

2. Lack of familiarity with the test procedures and personal bias were two major factors associated with these inaccuracies. Both may be reduced by better training and supervision.

3. Limitations in the test procedures are also a major factor. These cannot be eliminated completely but the twodrop Clinitest method for urine sugar offers several advantages and should be used in preference to the five-drop method.

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