HbA1c Plus FPG May be Superior to FPG Alone in Predicting Diabetes

FPG (fasting plasma glucose), HbA1c (Hemoglobin A1c) and the OGTT (oral glucose tolerance test) are typically used to determine if someone has prediabetes or diabetes. Indeed, all three measures are employed by the National Diabetes Prevention Program (National DPP) to help determine eligibility for the National DPP. So, these blood-based tests are important. A recent study focused on HbA1c and FPG to see if the combination of HbA1c plus FPG was a better predictor of diabetes than FPG. And the researchers indicated that the combination of elevated HbA1c plus elevated FPG was superior to elevated FPG alone in predicting a progression to diabetes.

The OGTT is considered by some to be the gold standard for diagnosing prediabetes and diabetes. While the OGTT may be more accurate, in general, than HbA1c in diagnosing prediabetes and diabetes, the HbA1c test is widely used, since it is more practical and it is considered to be a valid test for diagnosing prediabetes and diabetes.

In the above mentioned HbA1c-FPG related study, a meta analysis considered 3011 patients with prediabetes or elevated glucose levels. The researchers concluded that patients with a combination of elevated FPG and elevated HbA1c had the highest risk of diabetes. Specifically, the researchers indicated that "Using HbA1c in combination with FPG could identify subgroups of people with IFG [impaired fasting glucose] at highest risk of progression to DM."

While more research is needed to better predict the movement from prediabetes to diabetes, using the available results from recent studies, such as the study mentioned in this article, is a way to create better criteria for determining Diabetes Prevention Program eligibility.

Healthcare providers might want to give some attention to the study and other studies related to predicting the progression from prediabetes to diabetes. If we can improve our predictive capabilities, it will benefit patients. Improved diabetes-related predictive capabilities will also lead to more bang for the buck, since healthcare providers will be able to pinpoint and treat the patients who are more likely to move from prediabetes to diabetes.

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