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C-Peptide

Source Blood
Mnemonic CPEP
Specimen Requirements 1 x 3.0 or 4. 5 mL light green (mint) top PST tube. Gold top SST tube also acceptable.

0.5 mL plasma or serum

Minimum Whole Blood Volumes for Micro-Collections using Microtainers
Specimen Handling PSC & RRL:
Centrifuge, pour off and mark aliquot tube "SST" or "PST", then transport serum or plasma to DSC on ice.

Extra-regional:
Centrifuge, pour off and mark aliquot tube "SST" or "PST", then freeze serum or plasma before transporting to DSC.

DSC:
Freeze specimens upon receipt in lab; ensure frozen specimens do not thaw.
Additional Information Stimulated C-Peptides may be ordered at intervals after stimulation.
Testing Location Immunochemistry
Testing Frequency Once a week
Alternate Name(s)
Reference Interval Fasting: 0.40 - 1.40 nmol/L