Hyperglycaemia means that the amount of glucose in the blood is higher than expected.
Glucose is a sugar carried in the blood and used by the body for energy. Hyperglycaemia means the measured blood glucose is high. The context matters because glucose can be affected by meals, illness, medicines, and whether a person already has diabetes.
One high reading does not by itself establish a diagnosis of diabetes. Clinicians consider the type and timing of the test, symptoms, and other results. Persistently high or very high blood glucose can be harmful, so the result should be assessed in the clinical context rather than interpreted from the word “high” alone.

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