What color tube is used to draw rheumatoid factor?

Alternative Medicine
#1
#2

Patient Preparation
Fasting specimen preferred.
Collect
Serum separator tube or plasma separator tube. Also acceptable: Green (sodium or lithium heparin), lavender (EDTA), or pink (K2EDTA).

#3

Specimen Preparation
Allow specimen to clot completely at room temperature. Transfer 0.5 mL serum or plasma to an ARUP Standard Transport Tube. (Min: 0.5 mL)
Storage/Transport Temperature
Refrigerated.
Unacceptable Conditions
Body Fluid (refer to Rheumatoid Factor, Body Fluid, ARUP test code 2003347). Hemolyzed specimens.
Remarks

Stability
After separation from cells: Ambient: 24 hours; Refrigerated: 1 week; Frozen: 1 month (should not be thawed more than once)