There are three blood tests used to diagnose T2D: fasting plasma glucose, 2-hour plasma glucose during a 75-gram oral glucose tolerance test, and HbA1c (i.e., average plasma glucose levels over the past 3 months).[1]
How is type 2 diabetes diagnosed?
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•Last Updated: May 16, 2025
Type 2 diabetes is diagnosed using 3 blood tests: fasting plasma glucose, a 2-hour plasma glucose test during a 75-gram oral glucose tolerance test, and the HbA1c test, which measures average plasma glucose levels over the past 3 months.