Glycemic Control—Glycated hemoglobin (A1C) is the most widely used measure of
glycemic control. Unlike oral glucose tolerance tests and glucometer readings, which
measure blood glucose levels at a single point in time and are sensitive to food or drink
consumption, A1C tests measure three-month average blood glucose concentrations and are
unaffected by food and drink on the day of the test. In our study, a point-of-care
immunoassay device that had been certified by the National Glychohemoglobin
Standardization Program (NGSP) was used to measure patients’ A1C levels (Kennedy &
Herman, 2005).