C-Peptide, Serum or Plasma
0070103
Ordering Recommendation
Aids 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.
Mnemonic
C PEP
Methodology
Quantitative Chemiluminescent Immunoassay
Performed
Sun-Sat
Reported
Within 24 hours  
New York DOH Approval Status
This test is New York DOH approved.
Submit With Order
Specimen Required
Patient Preparation
Fasting specimen preferred.  
Collect
Serum separator tube or plasma separator tube. Also acceptable: Green (sodium or lithium heparin), lavender (EDTA), or pink (K2EDTA).  
Specimen Preparation
Allow specimen to clot completely at room temperature.  Separate serum or plasma from cells ASAP. Submit specimen in an ARUP Standard Transport Tube.  
Storage/Transport Temperature
Transport 1 mL serum or plasma, frozen. (Min: 0.5 mL)  
Unacceptable Conditions
Grossly hemolyzed specimens.  
Remarks
  
Stability
After separation from cells: Ambient: 8 hours; Refrigerated: 2 days; Frozen: 1 month  
Reference Interval
0.8-3.5 ng/mL  
Interpretive Data
 
Note
Reference interval applies to fasting specimens.  To convert to nmol/L, multiply ng/mL by 0.33.
CPT Code(s)
84681
Components
Component Test Code*Component Chart NameLOINC
0070103C-Peptide, Serum or Plasma1986-9
* Component test codes cannot be used to order tests. The information provided here is not sufficient for interface builds; for a complete test mix, please click the sidebar link to access the Interface Map.
Aliases
  • C Peptide
  • C Peptide Connecting Peptide of Insulin
  • C-Peptide, Serum
  • Connecting Peptide of Insulin