It isn't appropriate for me to comment on the case provided based on the information given. As a general guide, the 2 main issues to look at, are the presence of hypoglycaemia(low glucose levels) and hyperglycemia(high blood glucose levels). In terms of hypoglycaemia, if a patient is having low levels and is unaware of them or has had a major low(lost consciousness), then they shouldn't be driving without clearance from a doctor . In terms of high blood glucose, then higher blood glucose levels can cause tiredness and blurred vision which could affect driving. In terms of absolute guidelines for raised blood glucose, there is less clarity than with low blood glucose levels. The SA Guidelines have the following to say:'
While acute hyperglycaemia may
affect some aspects of brain function, there is insufficient
evidence to determine regular effects on driving performance
and related crash risk. Each person with diabetes should be
counselled about management of their diabetes during days
when they are unwell and should be advised not to drive if they are
acutely unwell with metabolically unstable diabetes.' I would recommend he sees his doctor and then to get feedback from there in terms of his fitness for driving
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