I have been recently diagnosed with type-2 diabetes. But my C-peptide value is just 0.3 ng/mL. The normal C-peptide levels range from 0.5 to 2.7 ng/mL. Does this mean that I have Type-1 diabetes and not Type-2 diabetes? Are there any other tests that will help me determine whether I have Type-1 or Type-2 diabetes?
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C-peptide is prepared by our body simultaneously as insulin is prepared So it’s easy to say that C-peptide levels can tell us how much insulin is being prepared. This will help diagnose the type of diabetes.
Type 1 diabetes has decreased insulin production. So the C-peptide level will be below here. Type 2 diabetes has resistance to insulin in cells, which means insulin is secreted normally.. So the C-peptide levels will be high.
So as you mentioned, your C-peptide level is 0.3, which indicates possibility of Type 1 diabetes.
Yes, there are other tests that will help differentiate Type 1 from Type 2.
Fasting insulin level along fasting blood sugar is a moderate budget test.High blood sugar and Low fasting insulin levels will denote Type 1 diabetes, while high will denote Type 2.
HLA typing is a genetic test, only for literature purposes. This test is never done in routine practice. It is very costly.
Read more about glycemic index.