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Test ID: FCPEP    
C-Peptide, Urine (Includes Creatinine)

Available on the App Store

Specimen Type Describes the specimen type needed for testing


Specimen Required Defines the optimal specimen. This field describes the type of specimen required to perform the test and the preferred volume to complete testing. The volume allows automated processing, fastest throughput and, when indicated, repeat or reflex testing.

50 mL aliquot from a 24-hour well-mixed 24-hour urine collection.

 No preservative. Refrigerate specimen during collection, and

send specimen frozen, on dry ice, in a plastic, 60-mL urine bottle.

Note:    24-Hour volume is required on request form for processing.



Specimen Minimum Volume Defines the amount of specimen required to perform an assay once, including instrument and container dead space. Submitting the minimum specimen volume makes it impossible to repeat the test or perform confirmatory or perform reflex testing. In some situations, a minimum specimen volume may result in a QNS (quantity not sufficient) result, requiring a second specimen to be collected.

Pediatric Minimum: 5.0 mL Note: This volume does not permit repeat analysis.

Reject Due To Identifies specimen types and conditions that may cause the specimen to be rejected




Warm reject; Cold OK







Specimen Stability Information Provides a description of the temperatures required to transport a specimen to the laboratory. Alternate acceptable temperature(s) are also included.

Specimen TypeTemperatureTime
UrineFrozen (preferred)30 days
 Refrigerated 48 hours
 Ambient 24 hours