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There are several blood tests that can diagnose Diabetes. The most common is a fasting blood glucose test, where the glucose level is measured after at least eight hours of fasting. The blood glucose can be measured without fasting, but it can only diagnose diabetes, not prediabetes.

The oral glucose tolerance test monitors how a body responds to an influx of glucose. After fasting for a least 8 hours, blood glucose levels are measured before and every 30-60 minutes after the ingestion of a glucose beverage for three hours.

A urine test for high levels of glucose and ketones can help diagnose diabetes, but these results are not enough on their own.

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