Ask the Diabetes Educator Archive


When fasting for a fasting glucose test that is done first thing in the morning, how long should one fast for? Is it 8 hours or 12 to 14 hours? Does it matter?

The textbook time to fast before a glucose test is 8 hours. However, when you are also testing for lipid levels, it has been my experience that 14 hours are better to clear the triglycerides.

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