Ordering Recommendation

Use to detect insulin secretion. Do not use to diagnose diabetes mellitus.

Mnemonic

CPEP UR

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
Collect

24-hour urine. Refrigerate during collection. Also acceptable: Random urine (no reference intervals).

Specimen Preparation

Transfer 2 mL aliquot from a well-mixed 24-hour urine to an ARUP Standard Transport Tube. (Min: 0.5 mL)

Storage/Transport Temperature

Frozen.

Unacceptable Conditions
Remarks
Stability

Ambient: 2 hours; Refrigerated: 24 hours; Frozen: 1 month

Reference Interval

14-156 µg/day

Interpretive Data

Per 24h calculations are provided to aid interpretation for collections with a duration of 24 hours and an average daily urine volume.  For specimens with notable deviations in collection time or volume, ratios of analytes to a corresponding urine creatinine concentration may assist in result interpretation.

Compliance Category

FDA

Note

Hotline History

N/A

CPT Codes

84681

Components

Component Test Code* Component Chart Name LOINC
0020207 Creatinine, Urine - per volume 2161-8
0020208 Creatinine, Urine - per 24h 2162-6
0081122 C-Peptide, Urine ng/mL 55920-3
0096367 C-Peptide, Urine 24 Hour 27944-8
0097110 Total Volume 19153-6
0097111 Hours Collected 30211-7
* 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

  • 24 hr c-peptide
  • C-Peptide, Urine
  • Connecting peptide insulin
  • Insulin C-peptide
  • Proinsulin C-peptide
  • Urine C- peptide
C-Peptide, 24-Hour Urine