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Medical visualization taken from human scanned data showing a man taking an OGTT. The oral glucose tolerance test (OGTT) measures blood glucose levels after the person being tested has fasted for a minimum of 8 hours and 2 hours after he or she drinks a sugary, glucose-rich beverage. The test is used to diagnose both prediabetes and diabetes. The OGTT is more sensitive than the FPG test for diagnosing prediabetes, but it is less convenient to administer.
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