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Test Code 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.


Secondary ID

75894

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 Urine

Specimen Type

Urine 24hr

Specimen 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

Reject Due To

pH <3 or pH >8 Reject

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 days

Performing Laboratory

LabCorp Burlington

CPT 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