Aid in the detection of insulinoma. May aid in distinguishing type 1 from type 2 diabetes mellitus (DM) in ambiguous cases. Do not use to diagnose DM.
Quantitative Chemiluminescent Immunoassay
Within 24 hours
Fasting specimen preferred.
Serum Separator Tube (SST) or Plasma Separator Tube (PST). Also acceptable: Green (Sodium or Lithium Heparin), Lavender (EDTA), or Pink (K2EDTA).
Allow specimen to clot completely at room temperature. Separate from cells ASAP or within 2 hours of collection. Transport 1 mL serum or plasma in an ARUP Standard Transport Tube. (Min: 0.5 mL)
Grossly hemolyzed specimens.
After separation from cells: Ambient: 8 hours; Refrigerated: 48 hours; Frozen: 1 month
The reference interval for fasting c-peptide is 0.8-3.5 ng/mL. To convert to nmol/L, multiply ng/mL by 0.33.
|Component Test Code*||Component Chart Name||LOINC|
|3000530||C Peptide, Other||1986-9|
- C Peptide
- C Peptide Connecting Peptide of Insulin
- C-Peptide, Serum
- Connecting Peptide of Insulin