Test Details: Insulin is a hormone produced by the beta cells of the pancreas. It regulates the uptake and utilization of glucose and is also involved in protein synthesis and triglyceride storage. Type 1 diabetes is caused by insulin deficiency due to destruction of beta cells while Type 2 diabetes is characterized by insulin resistance. Insulin levels may be increased in patients with pancreatic beta cell tumours. Test is useful in the management of diabetes mellitus and diagnosing insulinoma when used in conjunction with proinsulin and C-peptide measurements. In normal individuals, insulin levels parallel blood glucose levels while levels generally decline in patients with type 1 DM.