Diabetes Care, Vol 4, Issue 6 616-619, Copyright © 1981 by American Diabetes Association
Basal C-peptide in the discrimination of type I from type II diabetes
PG Webb and AM Bonser
Basal serum C-peptide concentrations in diabetic patients showed two
groups. Diabetic patients with low C-peptide levels (less than or equal to
0.16 nmol/L) have clinical characteristics of type I diabetes, and all were
on insulin therapy. With long duration of diabetes, an increasing
proportion had undetectable C-peptide. Diabetic patients with high
C-peptide levels (greater than 0.16 nmol/L) resemble type II diabetes. In
this group 30% were on insulin therapy but duration of known disease was
not associated with any decline in the high basal C-peptide levels. The
small proportion of diabetic patients with basal serum C-peptide in the
range of 0.17-0.32 nmol/L have indeterminate status.