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HelpTest ID FCPEU C-Peptide, 24-Hour Urine
Necessary Information
24-Hour volume (in milliliters) is required.
Specimen Required
Patient Preparation: It is recommended to ask all patients who may be indicated for this test about biotin supplementation. Patients should be cautioned to stop biotin consumption at least 72 hours prior to the collection of a sample.
Collection Container/Tube: Clean, plastic 24-hour urine collection container.
Submission Container/Tube: Plastic urine container.
Specimen Volume: 10 mL
Collection Instructions:
1. Instruct the patient to void at 8 AM and discard the specimen.
2. Collect all urine including the final specimen voided at the end of the 24-hour collection period (ie, 8 AM the next morning) in a 24-hour urine collection container. pH should be 4 to 7.
3. Refrigerate specimen during the 24-hour collection.
4. Aliquot and send 10 mL urine in plastic urine container frozen.
5. 24-Hour collection volume is required.
Useful For
Urine C-peptide is measured when a continuous assessment of B-cell function is desired or frequent blood sampling is not practical (eg, in children). C-peptide excretion in urine has been used to access pancreatic function in gestational diabetes and in patients with unstable glycemic control in insulin-dependent diabetes mellitus (IDDM).
Method Name
Electrochemiluminescence immunoassay (ECLIA)
Reporting Name
C-Peptide, 24-Hour UrineSpecimen Type
Urine 24hrSpecimen Minimum Volume
1 mL (Note: this volume does not allow for repeat testing.)
Specimen Stability Information
| Specimen Type | Temperature | Time | Special Container |
|---|---|---|---|
| Urine 24hr | Frozen (preferred) | 14 days | |
| Refrigerated | 14 days |
Reference Values
C-Peptide, Urine: Not Established ng/mL
C-Peptide, Urine 24 hr: 17.2-181.0 ug/24 hr
Day(s) Performed
Monday through Saturday
Report Available
4 to 8 daysPerforming Laboratory
LabCorp BurlingtonCPT Code Information
84681
LOINC Code Information
| Test ID | Test Order Name | Order LOINC Value |
|---|---|---|
| FCPEU | C-Peptide, 24-Hour Urine | Not Provided |
| Result ID | Test Result Name | Result LOINC Value |
|---|---|---|
| Z6358 | C-Peptide, Urine | 1987-7 |
| Z6359 | C-Peptide, Urine 24hr | 27944-8 |
| Z6360 | Urine Volume (Milliliters) | Not Provided |