I actually can't remeber now if it's 6 or 7mmol/...
Your friend blood glucose is slightly on the higher side as one would expect to see a reading below 5.5mmol/l or there abouts give or take a little...
Your friends doctor will be able to get clearer picture, they might do a finger prick test at the surgery, and/or might send a blood sample to determin the Ha1bc level, this will show what sort of adverage glucose has been for the last 3 months..
There are many factors that might effect the reading at the chemist, illness, stress and infection can raise the blood glucose, so your friend might have this ruled out by the doctor...
If it turns out that your friend is diabetic then there are several ways this can be treated, depending what there results are, they might be advised to change there diet, cutting out sugery foods, drinks and be weary of eating large amounts of carbohydrates as these will raise the bloode glucose levels.. It might be decided that tablets are needed to control the blood sugar levels.. Insulin is normally used by Type 1 diabetics that produce no insulin...
But there doctor will let them know what is what at there appointment...