The purpose of the ngsp is to standardize hemoglobin a1c test results to those of the diabetes control and complications trial (dcct) and united kingdom prospective diabetes study (ukpds) which established the direct relationships between hba1c levels and outcome risks in patients with diabetes..
The relationship between eag and hba1c based on linear regression analysis was: eag(mg/dl)= (28.7*hba1c)-46.7, r2=0.84. more information on the relationship between glucose and hba1c can be found here. table 1 below depicts the relationships between ngsp and ifcc hba1c as well as with eag (mmol/l and mg/dl). (hba1c) test results in the us.