Hypoglycaemia is usually defined as a blood glucose below 2.2 mmol/l. Most people counter-regulate in some way at these glucose concentrations. At low blood glucose levels blood glucose testing strips may be difficult to read accurately by eye. A meter is better. It is safest to tell patients that if their blood glucose is below 4 mmol/l they should stop what they are doing and eat a snack or a meal. They should check their glucose again soon. In a potentially dangerous situation or where rapid relief of symptoms of hypoglycaemia is required, they should stop and eat glucose, followed by a snack or meal, and check their blood glucose again soon (see p. 100).
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