Rheumatoid Factor, Blood

Collection Instruction

Serum separator tube or plasma separator tube. Also acceptable: Green (lithium heparin), lavender or pink (K2EDTA). Allow specimen to clot completely at room temperature. Separate from cells ASAP or within 2 hours of collection. Transfer 0.5 mL serum or plasma to an ARUP transport tube. Fasting specimen preferred.

Specimen Stability

24 Hours Ambient; 8 Days (Refrigerated 2-8°C); 3 Months (Frozen -70°C)

CPT Code(s)

86431

Turnaround Time

72 Hours

Reference Range