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High blood sugar (hyperglycaemia)
High blood sugar (hyperglycaemia) is where the level of sugar in your blood is too high.
Symptoms of high blood sugar in non diabetics
It mainly affects people with diabetes and can be serious if not treated.
People with diabetes can also have blood sugar that's too low. This is called low blood sugar (hypoglycaemia).
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.
| 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 an
- signs your sugar level is too high
- symptoms my blood sugar is too high