C-Peptide, 24-Hour Urine
Also known as: CPEP UR
Use
This test is utilized to detect insulin secretion by measuring the concentration of C-Peptide in a 24-hour urine collection. It is particularly useful in understanding endogenous insulin production and differentiating between insulin and C-Peptide secretion in conditions affecting insulin dynamics. However, it should not be used for diagnosing diabetes mellitus.
Special Instructions
Collection requires a full 24-hour urine sample. During the collection period, the urine should be kept refrigerated to ensure sample integrity. It is crucial to note any deviations in the collection time or volume, as these can affect the interpretation of results.
Limitations
This test has limitations in that it should not be used for diagnosing diabetes mellitus. Variability in urine collection time or volume can impact the accuracy of the results. For specimens with notable deviations in collection time or volume, it's important to interpret results in conjunction with the concentration of urine creatinine. Ratios of analytes to urine creatinine concentration can provide additional context and assist in result interpretation.
New York Approved
Methodology
Immunoassay (CLIA)
Biomarkers
LOINC Codes
- 35674-1
- 2162-6
- 55920-3
- 27944-8
- 19153-6
- 30211-7
Result Turnaround Time
1 day
Related Documents
For more information, please review the documents below
Specimen
Urine
Volume
2 mL
Minimum Volume
0.5 mL
Container
ARUP Standard Transport Tube
Collection Instructions
Collect 24-hour urine and refrigerate during collection. Transfer a 2 mL aliquot from a well-mixed 24-hour collection.
Stability Requirements
| Temperature | Period |
|---|---|
| Room Temperature | 2 hours |
| Refrigerated | 7 days |
| Frozen | 1 month |