C-Peptide
The C-peptide test measures a byproduct released when your body produces insulin, indicating how much natural insulin your pancreas is making. This test helps distinguish between different types of diabetes and evaluates pancreatic function.
Fasting Blood Glucose (FBG)
Fasting Blood Glucose measures your blood sugar level after not eating or drinking anything (except water) for at least 8 hours. It is one of the primary tests used to screen for and monitor diabetes and prediabetes.