The complete absence of symptoms and a chance finding of a raised fasting plasma glucose (>7 mmol/L) or a raised random plasma glucose (>11.1 mmol/L) is one of the commonest presentations of diabetes, especially T2DM.

However, if the patient is truly asymptomatic, current WHO criteria are that two elevated plasma glucoses should be recorded before the diagnosis is confirmed. It is also important to rule out intercurrent illness such as infection that may lead to stress hyperglycaemia.

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