At LabCorp, Rheumatoid Factor (RF) is drawn in a Red-top tube, gel-barrier tube, lavender-top (EDTA) tube, or green-top (heparin) tube, order code 006502.
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Rheumatoid Factor (RF) tube and order code at LabCorp
LabCorp verified by: Mandi Boss B Franklin, Aug 23, 2026
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