According to SA guidelines, a fasting glucose(done in the morning after fasting for 8 hours) is considered normal if it is less than 6.1, pre-diabetes if it is between 6.1 and 7, and diabetes if it is 7 or more. The lower end of the glucose range is considered to be around 4. In America they will use a fasting glucose level of 5.6 instead of 6.1. One of the cause of confusion is that sometimes guidelines talk about plasma glucose and whole blood glucose. The ones mentioned by me refer to plasma glucose levels whereas ones done by home glucose testing would reflect whole blood glucose. Plasma levels are about 10-15% higher than whole blood readings.
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