Lab comparison
Insulin: 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.
| Requirement | Quest Diagnostics | LabCorp | BioReference |
|---|---|---|---|
| Test code | 561 | 004333 | 1648-5 |
| Primary tube | Serum tube | Red-top tube or gel-barrier tube | SST Tube |
| Specimen type | 1 mL serum | Serum | 1 mL SST Tube |
| Patient prep | Fasting specimen required | Fasting specimen required | Fasting specimen required |
| 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 Insulin?
The Quest Diagnostics order code for Insulin is 561.
What tube color does LabCorp use for Insulin?
LabCorp uses a Red-top tube or gel-barrier tube for Insulin.
Does Insulin require fasting?
Insulin patient prep: Fasting specimen required. 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.
Need the full lookup, not just a comparison?
No login · Zero PHI · Clinician-verified · Quest + LabCorp + BioReference.