What is C-peptide? Is this patient’s C-peptide concentration likely to be low, normal or high/why?

The C-peptide is the connecting peptide that connects the A-chain of insulin to the B-chain of insulin in the proinsulin molecule. The amount of insulin molecules produced in the body is determined by the level of C-peptide. C-peptide levels drop dramatically in diabetic ketoacidosis. In diabetes mellitus, our immune system attacks the pancreatic beta cells (insulin-producing cells), and c-peptide is produced in conjunction with pro-insulin by beta cells. As a result, c-peptide levels are low or deficit in DKA patients