American Diabetes Association
One of four tests can be used to establish a firm diagnosis of diabetes:
Fasting plasma glucose (FPG) >125 mg/dL (most commonly used)
Random plasma glucose ≥200 mg/dL with diabetes symptoms such as polyuria, polydipsia, fatigue, or weight loss
2-hour post-load glucose ≥200 mg/dL on a 75 g oral glucose tolerance test
All of these require confirmation with a second test, which may be the same test or a different test. One option is to test both HbA1c and FPG on a single blood sample.
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