Lab comparisonCPT 85027
CBC with Differential: Quest vs LabCorp vs BioReference, tube, code & requirements
Complete blood count including white blood cell differential. 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 | 6690 | 005199 | 0700199 |
| Primary tube | Lavender Top (EDTA) | Lavender Top (EDTA) | Lavender Top (EDTA) |
| Specimen type | Whole Blood | Whole Blood | Whole Blood |
| Patient prep | None | None | None |
Frequently asked questions
What is the Quest Diagnostics order code for CBC with Differential?
The Quest Diagnostics order code for CBC with Differential is 6690.
What tube color does LabCorp use for CBC with Differential?
LabCorp uses a Lavender Top (EDTA) for CBC with Differential.
Does CBC with Differential require fasting?
No fasting is required for CBC with Differential.
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.