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.

Specimen Required

Patient Preparation

Fasting specimen preferred.

Collect

Serum separator tube

Specimen Preparation

Allow specimen to clot completely at room temperature.  Separate serum from cells ASAP. Submit specimen in an ARUP Standard Transport Tube.

Storage/Transport Temperature

Transport 1 mL serum frozen. (Min: 0.5 mL)

Unacceptable Conditions

Grossly hemolyzed specimens.

Remarks
Stability

Ambient: 8 hours; Refrigerated: 7 days; Frozen: 1 month

Reference Interval

Effective August 16, 2021
0.5-3.3 ng/mL

Interpretive Data



Compliance Category

FDA

Note

Reference interval applies to fasting specimens.  To convert to nmol/L, multiply ng/mL by 0.33.

Hotline History

N/A

CPT Codes

84681

Components

Component Test Code* Component Chart Name LOINC
0070103 Serum, C-Peptide 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
Serum, C-Peptide