Test Code CPEP C-Peptide, Serum
Additional Codes
Sunrise Clinical Manager (SCM) Orderable: C-Peptide, Serum
AllScripts (AEHR) Orderable: C-Peptide, Serum
Performing Laboratory
Northwell Health Laboratories
Methodology
Electrochemiluminescence Immunoassay (ECIA)
Reference Values
1.1 - 4.4 ng/mL
Test Classification and CPT Coding
84681
Physician Office Specimen Requirements
Container/Tube: Gold-top tube(s)
Specimen: 2 mL serum ( 1 mL min)
Transport Temperature: Frozen Serum
Note:
12 hours before this test do not take multivitamins or dietary supplements containing biotin or vitamin B7, which are commonly found in hair, skin, and nail supplements and multivitamins
Day(s) and Time(s) Performed
Monday through Friday
Computer Interface Code
PDM # 5900100
Used For
Diagnostic workup of hypoglycemia:
-Diagnosis of factitious hypoglycemia due to surreptitious administration of insulin
-Evaluation of possible insulinoma
-Surrogate measure for the absence or presence of physiological suppressibility of endogenous insulin secretion during diagnostic insulin-induced hypoglycemia (C-peptide suppression test)
Assessing insulin secretory reserve in selected diabetic patients (as listed below) who either have insulin autoantibodies or who are receiving insulin therapy:
-Assessing residual endogenous insulin secretory reserve
-Monitoring pancreatic and islet cell transplant function
-Monitoring immunomodulatory therapy aimed at slowing progression of preclinical, or very early stage type 1 diabetes mellitus