Test Code CPEPS / CPR-M 
Methodology Automated Chemiluminometric Immunoassay 
Description Useful as a diagnostic work-up of hypoglycemia, diagnosis of factitious hypoglycemia due to surreptitious administration of insulin, for evaluation of possible insulinoma, as a surrogate measure for the absence or presence of physiological suppressibility of endogenous insulin secretion during diagnostic insulin-induced hypoglycemia, in assessing insulin secretory reserve in selected diabetic patients who either have insulin autoantibodies or who are receiving insulin therapy, in the assessment of residual endogenous insulin secretory reserve, for monitoring pancreatic and islet cell transplant function, and for monitoring immunomodulatory therapy aimed at slowing progression of preclinical, type 1 DM. 
Specimen Draw blood in a plain, red-top or serum gel-tube from a fasting patient. Spin down and send 0.5 mL (minimum: 0.3 mL) of serum refrigerated in a screw-capped, plastic vial. 
Reference Values 0.9 - 4.3 ng/mL
297 - 1419 pmol/L 
Analytic Time 1 Day 
Day(s) Test Set Up Monday through Saturday 
CPT Code(s) 84681