Ordering Recommendation

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.

Mnemonic
CPEPOTHER
Methodology

Quantitative Chemiluminescent Immunoassay

Performed

Sun-Sat

Reported

Within 24 hours

New York DOH Approval Status
This test is New York DOH approved.
Specimen Required
Patient Preparation

Fasting specimen preferred.

Collect

Serum Separator Tube (SST) or Plasma Separator Tube (PST). Also acceptable: Green (Sodium or Lithium Heparin), Lavender (EDTA), or Pink (K2EDTA).

Specimen Preparation

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)

Storage/Transport Temperature

Frozen.

Unacceptable Conditions

Grossly hemolyzed specimens.

Remarks
Stability

After separation from cells: Ambient: 8 hours; Refrigerated: 48 hours; Frozen: 1 month

Reference Interval

Not established.

Interpretive Data

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.

No compliance statements are in use for this test.

Note
Hotline History
N/A
CPT Codes

84681

Components
Component Test Code* Component Chart Name LOINC
3000530 C Peptide, Other 1986-9
* 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
C-Peptide, Other