Lab comparisonCPT 85610
Prothrombin Time with INR: Quest vs LabCorp vs BioReference, tube, code & requirements
Measures blood clotting time and INR ratio. 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 | 8847 | 005041 | 0856100 |
| Primary tube | Light Blue Top (Citrate) | Light Blue Top (Citrate) | Light Blue Top (Citrate) |
| Specimen type | Plasma | Plasma | Plasma |
| Patient prep | None | None | None |
Frequently asked questions
What is the Quest Diagnostics order code for Prothrombin Time with INR?
The Quest Diagnostics order code for Prothrombin Time with INR is 8847.
What tube color does LabCorp use for Prothrombin Time with INR?
LabCorp uses a Light Blue Top (Citrate) for Prothrombin Time with INR.
Does Prothrombin Time with INR require fasting?
No fasting is required for Prothrombin Time with INR.
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.