In a study done by a team of Japanese researchers the diabetes HGB A1C test is best done in conjunction with a fasting plasma glucose (FPG) test to better predict risk of the development of diabetes. The study tested non-diabetic men and women between the ages of 24 to 82. At the beginning of the test 4,103 had A1C and FPG levels within the normal range, 1,167 had elevated FPG only, 382 had elevated A1C only, and 256 had both forms elevated. The results of diagnosis of individuals with elevated levels 4.7 years later found that 8-9% of patients who had only one test were diagnosed with diabetes compared with 60% with both tests.

HGB A1C Diabetes Diagnosis Accuracy

After the American Diabetes Association began endorsing A1C testing for the screening of diabetes several studies were conducted to examine how accurate the test is. Previously FPG and oral …