Random testing during the day won't tell you anything meaningful. The general testing regime that we follow is to test on waking (ie, a fasting test, as you won't have eaten or drank anything overnight) then immediately before a meal and then again 2 hours afterwards. For the majority of healthy individuals, normal blood sugar levels are:
- Between 4.0 to 5.4 mmol/L fasting
- Up to 7.8 mmol/L 2 hours after eating
A week's readings should give you some idea of whether you should be asking your GP for an HbA1c test.
Martin