RHEUMATOID FACTOR

Specimen Required
Draw blood in a SST. Centrifuge, separate and send 1.0 mL serum (0.5 mL minimum) refrigerated in a screw-capped plastic vial.

Alternate Specimen
Plasma: EDTA, heparin (lithium)

Rejection Criteria
CSF

Methodology
Nephelometry

Stability
Refrigerated: 7 days; Frozen: 3 months

Reference Range
<15 IU/mL

Performed
Sunday-Friday

Turnaround Time3 days
Test CodeRF
CPT-4 Code (s)
86431
LOINC Codes
15205-8

Warde
Medical
Laboratory