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Oral Glucose Tolerance Test

technique

2 creators use or recommend it

▲ 1 active in the last 90 days

2 recommend
Last discussed Nov 11, 2026

A clinical diagnostic test where a patient consumes a glucose solution and blood glucose is measured at intervals over 2 hours, used to assess insulin resistance and diagnose diabetes or pre-diabetes.

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Tim Ferriss and Peter Attia use or recommend Oral Glucose Tolerance Test. See what else they have in common.

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What creators say

Tim Ferriss
recommends
Used for: Assessing glucose handling and insulin sensitivity Praised: More informative than fasting insulin, which can swing all over the place vs: Compared to hemoglobin A1C and fasting insulin

"Ultimately, I do think most people, if they can afford it, should get an oral glucose tolerance test, where you're kind of taking blood and measuring things every 30 minutes for 2 hours. Talk to your doctor."

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Peter Attia
recommends
Used for: Assessing glucose and insulin response vs: Better than hemoglobin A1c

"There was a day when you would use the OGTT to diagnose type 2 diabetes, and not what we do today, which is rely on hemoglobin A1c. I think the use of an OGTT is a better test, and I think the hemoglobin A1c is not a particularly helpful test."

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