C-Peptide is drawn in a SST at Quest, a Red-top tube or gel-barrier tube at LabCorp, and a SST Tube at BioReference.
Lab comparison
C-Peptide: Quest vs LabCorp vs BioReference, tube, code & requirements
. This page shows collection requirements for all three major reference labs in one view, so you don’t have to cross-check three portals.
Always verify against your lab’s current collection manual before drawing.
Every value on this page is verified by a nurse practitioner in active clinical practice, not scraped from an automated source.
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| Requirement | Quest Diagnostics | LabCorp | BioReference |
|---|---|---|---|
| Test code | 372 | 010108 | 0578-5 |
| Primary tube | SST | Red-top tube or gel-barrier tube | SST Tube |
| Specimen type | 1 mL serum | Serum | 1 mL SST Tube |
| Patient prep | Patient should fast 12 hours prior to collection | Patient should fast 12 hours prior to collection | Patient should fast 12 hours prior to collection |
| Minimum volume | Minimum Volume 0.5 mL | Minimum Volume 0.3 mL (Note: This volume does not allow for repeat testing.) | Qty 1 |
Frequently asked questions
What is the Quest Diagnostics order code for C-Peptide?
The Quest Diagnostics order code for C-Peptide is 372.
What tube color does LabCorp use for C-Peptide?
LabCorp uses a Red-top tube or gel-barrier tube for C-Peptide.
Does C-Peptide require fasting?
C-Peptide patient prep: Patient should fast 12 hours prior to collection. Always confirm with the ordering lab before the draw.
Data provenance
Source: Quest Diagnostics specimen collection manual, LabCorp directory of services, and BioReference laboratory collection guide.
Verified by: a licensed nurse practitioner in active clinical practice. Values are reviewed against each lab’s published collection requirements. Always confirm against your lab’s current manual before drawing.
Quest verified by: Mandi Boss B Franklin, Jul 16, 2026
LabCorp verified by: Mandi Boss B Franklin, Jul 16, 2026
BioReference verified by: Mandi Boss B Franklin, Jul 16, 2026
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