Fast Five Quiz: Prediabetes

Anne L. Peters, MD


October 03, 2019

The ADA, WHO and IDF use varying thresholds and criteria for assessing prediabetes, including differences in IFG thresholds and the utility of the A1c test. With a range of criteria available for prediabetes identification, populations with prediabetes identified by each method vary widely and have limited overlap. The ADA threshold for IFG is 5.6-6.9 mmol/L (100-125 mg/dL), whereas the WHO uses a higher range of 6.1-6.9 mmol/L (110-125 mg/dL).

Unlike the ADA, the WHO does not endorse the use of the A1c test to screen for prediabetes. The availability of A1c testing may be limited in developing countries and may explain this decision. However, the A1c test is considered by many experts as a more reliable test of impaired glucose homeostasis because it is reflective of steady-state blood glucose levels over a period of several months; therefore, it is not prone to the day-to-day variability that may confound assessment of IGT or IFG.

Learn more about prediabetes thresholds and classification and diagnosis.


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