Blood glucose levels are measured in units called mmol/L (pronounced milli-moles-per-litre). The ideal ranges are:
- Before meals: 4-7 mmol/L
- Two hours after meals: 8-9 mmol/L
- At bedtime: 6-10 mmol/L
You may need to consult your doctor and change your treatment plan if:
- Blood glucose is consistently lower than 4 mmol/L or higher than 10 mmol/L before meals
- Blood glucose is consistently lower than 6 mmol/L or higher than 12 mmol/L at bedtime
Blood glucose goals may be modified for children and others who are at greater risk of hypoglycaemia. In the US, blood glucose levels are measured in mg/dl (milligrams per decilitre). That’s why you’ll occasionally read about blood glucose readings that seem very high, like 140 or 220. To convert the American scores back to mmol/L, just divide the number by 18.