Warning over using HbA1c alone to diagnose diabetes

Oral glucose tolerance test is much better at case-finding, study shows

Diagnosing type 2 diabetes on the basis of a single HbA1c test will miss nearly three-quarters of people with the disease, according to results announced at a major conference.

Test tube with blood for HbA1c test

Presenting to delegates at the US Endocrine Society’s annual meeting in New Orleans, Dr Maria Chang Villacreses said that compared to an oral glucose tolerance test (OGTT), 73% of people with diabetes would be missed if diagnoses were made on the basis of an HbA1c test alone.

In the study of 9000 participants in the 2005-14 National Health and Nutrition

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