<unk>  is a peptide which is made when proinsulin is split into insulin and<unk> . They split when proinsulin is released from the pancreas into the blood in response to a rise in serum glucose - one<unk>  for each insulin molecule.
In proinsulin,<unk>  is an amino-acid chain connecting A and B chains of insulin
The level of<unk>  in the body is indicative of how much insulin is being produced in the body 
Reference range: 0.33-1.20 nmol/l
C-peptide
Glucagon-like peptide-1
Glucose
Histrelin
Glucose tolerance test
Cosyntropin
Plasma osmolality
Amylase