ARUP's Laboratory Test Directory

0050465: Rheumatoid Factor

Test Mnemonic: RA
Methodology: Immunoturbidimetric

Performed: Sun-Sat

Reported: Within 24 hours

Specimen Required:  
Collect: One 4 mL SST.

Transport: 0.5 mL serum at 2-8°C. (Min: 0.3 mL) Submit specimen in an ARUP Standard Transport Tube.

Pediatric Collection/Transport: 0.2 mL serum at 2-8°C.

Remarks: Serum is the only acceptable specimen type for this assay without a disclaimer.  Allow serum to clot completely at room temperature before centrifuging.  

Unacceptable Conditions: Plasma.  Hemolyzed specimens.

Stability: After separation from cells: Ambient: 24 hours; Refrigerated: 1 week; Frozen: 2 weeks (should be thawed only once)

Reference Interval:
0-14 IU/mL

CPT Code(s):
86431