[1] The American Diabetes Association does not recommend a PPG test for determining diabetes,[2] but it notes that postprandial hyperglycemia does contribute to elevated glycated hemoglobin levels (a primary factor behind diabetes) and recommends testing and management of PPG levels for those patients who maintain optimum pre-prandial blood glucose levels but have high A1C values.

[3] Carbohydrates in the form of glucose are one of the main constituents of foods, and assimilation starts within about 10 minutes.

[1] In 2011, the International Diabetes Federation noted elevated PPG levels to be an independent risk factor for macrovascular disease; this had been since challenged on previous grounds and that PPG might be simply a marker or a surrogate of a complex series of metabolic events occurring in the postprandial period, that is already better reflected through other parameters.

[4] A detailed 2001 review by the American Diabetes Association had earlier noted that correlations of PPG values with other diabetics parameters were often understudied and widely variant, whilst chronic diabetes-related complications have been demonstrated over a too-broad range of PPG values, to be independently attributed to; the 2018 Standards of Medical Care in Diabetes follows the same theme roughly.

[1][3] A 2019 review in Obesity Reviews was similar and noted inconclusive data as to the importance of PPG as a standalone parameter in diabetes diagnosis and management; it went on to propose a hyperglycemia-diabetes-CVD continuum and also criticized the lack of rigid standardization of a PPG test.