CBC (includes Differential and Platelets) is drawn in a EDTA (lavender-top) at Quest, a Lavender-top (EDTA) tube at LabCorp, and a Lavender top- EDTA at BioReference.
Lab comparison
CBC (includes Differential and Platelets): 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 | 6399 | 005009 | 0053-9 |
| Primary tube | EDTA (lavender-top) | Lavender-top (EDTA) tube | Lavender top- EDTA |
| Specimen type | Whole blood from a full EDTA (lavender-top) tube | Whole blood | Lavender top- EDTA |
| Patient prep | See lab specimen manual | See lab specimen manual | See lab specimen manual |
Frequently asked questions
What is the Quest Diagnostics order code for CBC (includes Differential and Platelets)?
The Quest Diagnostics order code for CBC (includes Differential and Platelets) is 6399.
What tube color does LabCorp use for CBC (includes Differential and Platelets)?
LabCorp uses a Lavender-top (EDTA) tube for CBC (includes Differential and Platelets).
Does CBC (includes Differential and Platelets) require fasting?
CBC (includes Differential and Platelets) patient prep: See lab specimen manual. 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 4, 2026
LabCorp verified by: Mandi Boss B Franklin, Jul 4, 2026
BioReference verified by: Mandi Boss B Franklin, Jul 8, 2026
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