Sunshine girl
Hope I don’t confuse things
In the UK the finger prick monitors measure glucose in the blood in mmol/L not a percentage.
In the USA the monitors measure glucose in mg/dl (and it looks as though you do in France also)
To get the UK mmol/L figure you are right to divide a reading of say 65 or 70 by 18. The resulting 3.6 or 3.8 mmol/L is definitely going into a hypo. The finger prick monitor and the Hb1ac are measuring two completely different things. The finger prick will measure if you are having a hypo – the Hb1ac does not – it just measures an average of your blood sugars over a period of time.
If you have that sort of reading in the UK it is definitely a hypo if you are on insulin. If driving you have to pull over. Take the keys out of the ignition and eat some glucose. You cannot commence driving for 40 minutes. Blood sugars must be over 4.0 mmol/L to drive. If they are under 5 you can still drive but need to take some glucose.
Hb1ac measures how much haemoglobin in the blood has become glycated (chemically bonded with glucose) – it doesn’t measure glucose in the blood like a finger prick monitor. The measurement we use in the UK have changed and are now reported as a measurement in mmols/mol instead of the percentage which they used to use.
So an Hb1ac of 37 mmols/mol is 5.5% (in the old way of measuring as a percentage) and equates to an average blood sugar over the period of 6.2 mmol/L.
41 mmols/mol is 5.9% and equates to an average blood sugar of 6.8 mmol/L
42 mmols/mol is 6.0% and equates to an average blood sugar of 7.0 mmol/L
I do hope I haven’t confused things, but I was concerned that you might drive while having a hypo while on insulin.