Hyperglycemia, or high blood sugar (also spelled hyperglycaemia or hyperglycæmia, not to be confused with hypoglycemia) is a condition in which an excessive amount of glucose circulates in the blood plasma. This is generally a glucose level higher than 11.1 mmol/l. Reference ranges for blood tests are 11.1 mmol/l, but symptoms may not start to become noticeable until even higher values such as 250–300 mg/dl or 15–20  mmol/l.

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