Conditions

Diabetes

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Q&A

What is a dangerous blood sugar level?

Danger lies at both ends. Below 70 mg/dL blood sugar is too low; sustained highs can tip into ketoacidosis above 200 mg/dL or a hyperosmolar crisis above 600. Both extremes are medical emergencies.

EXPLAINER

What is a normal blood sugar level?

There is no single number. Normal depends on which test is used and whether you have fasted — and the cut-offs that define prediabetes and diabetes are lines drawn on a continuous scale.


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