Rheumatoid Factor (RF) is drawn in a Serum separator tube (SST) at Quest, a Red-top tube, gel-barrier tube, lavender-top (EDTA) tube, or green-top (heparin) tube at LabCorp, and a SST Tube at BioReference.
Lab comparison
Rheumatoid Factor (RF): 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 | 4418 | 006502 | 0796-3 |
| Primary tube | Serum separator tube (SST) | Red-top tube, gel-barrier tube, lavender-top (EDTA) tube, or green-top (heparin) tube | SST Tube |
| Specimen type | Serum or plasma | 1 mL SST Tube | |
| Patient prep | None Specified | None Specified | None Specified |
| Minimum volume | Minimum volume 0.5 mL | Minimum Volume 0.5 mL | Qty 1 |
Frequently asked questions
What is the Quest Diagnostics order code for Rheumatoid Factor (RF)?
The Quest Diagnostics order code for Rheumatoid Factor (RF) is 4418.
What tube color does LabCorp use for Rheumatoid Factor (RF)?
LabCorp uses a Red-top tube, gel-barrier tube, lavender-top (EDTA) tube, or green-top (heparin) tube for Rheumatoid Factor (RF).
Does Rheumatoid Factor (RF) require fasting?
Rheumatoid Factor (RF) patient prep: None Specified. 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, Aug 23, 2026
LabCorp verified by: Mandi Boss B Franklin, Aug 23, 2026
BioReference verified by: Mandi Boss B Franklin, Aug 23, 2026
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