Get your Health question answered in 3 easy steps
A Doctor will be with you shortly
Ask a Doctor Now
141 Doctors are Online

Is OGTT better than Hba1c test to diagnose prediabetes or diabetes?

User rating for this question
Very Good
Answered by

Practicing since : 2006
Answered : 1767 Questions
I have been asked to take more detailed tests for diabetes or pre-diabetes. My current plasma glucose level is 5.0 fasting.

Is an oral glucose tolerance test more accurate or would lead to a better idea of my condition than the HbA1c test?

Wed, 9 May 2018 in Diabetes
Answered by Dr. Mirjeta Guni 1 hour later
Brief Answer:
Best test to diagnose Diabetes:

Detailed Answer:
Hello and thank you for asking!
Your question is very interesting. Today there are many studies that intend to compare the sensitivity of type 2 Diabetes diagnosis tests and Hba1c results more sensitive than fasting plasma glucose and OGTT.
So i would recommend to check HbA1c rather than preform OGTT.
Here is a large study confirming it.

Best wishes,

Above answer was peer-reviewed by
Follow-up: Is OGTT better than Hba1c test to diagnose prediabetes or diabetes? 1 hour later
Thanks Dr. Mirjeta,

I will consider asking for this test. Thanks for the link. I have read it briefly. Is it correct to say that the HbA1c test is still only roughly 70% accurate or will only pick up diabetes in 70% of patients who have the condition?

Answered by Dr. Mirjeta Guni 43 minutes later
Brief Answer:
About HbA1c sensitivity:

Detailed Answer:
Welcome back!
It means that it is 70% accurate if used alone to diagnose DIabetes, of course together with fasting and postprandial glucose checks, the sensitivity increases.
Best wishes,
Above answer was peer-reviewed by
Share on Facebook
Share on Twitter
Share on Google+
Question is related to
Medical Topics

The user accepted the expert's answer

Ask a Diabetologist

© Ebix, Inc. All Rights Reserved.
All the information, content and live chat provided on the site is intended to be for informational purposes only, and not a substitute for professional or medical advice. You should always speak with your doctor before you follow anything that you read on this website. Any health question asked on this site will be visible to the people who browse this site. Hence, the user assumes the responsibility not to divulge any personally identifiable information in the question. Use of this site is subject to our Terms & Conditions
Already Rated.
Your rating:

Ask a Doctor