High Blood Sugar (hyperglycaemia) - NHS

High blood sugar levels

If you have diabetes, you can find out if your blood sugar level is high by having a blood sugar (blood glucose) test.

You may have regular tests by your care team or GP surgery, or you may have tests you can do at home.

Types of diabetes test and high blood sugar levels.
Type of test High level
Test done by a health professional to check your blood sugar level over the last 2 or 3 months (HbA1c test) 48 mmol/mol or over (6.5% if you're given a percentage)
Test done by a health professional after not eating for a few hours (fasting glucose test) Over 7 mmol/L
Home test done after waking up or before eating Over 7 mmol/L
Home test done at any other time Over 11 mmol/L

Important

These blood sugar levels are a guide. Your levels may be different depending on your age and the type of diabetes you have. Check with your doctor or care team.

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