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Rheumatoid Factor (RF)

Ordering Recommendation

Aids in the workup of suspected rheumatoid arthritis or undifferentiated inflammatory arthritides. Consider ordering this test in conjunction with Cyclic Citrullinated Peptide (CCP) Antibody, IgG (0055256) to increase specificity and sensitivity. Rheumatoid Arthritis Panel (3004055) is the preferred test.

Mnemonic
Methodology
Quantitative Immunoturbidimetry
Performed
Mon-Sat
Reported
Within 24 hours
New York DOH Approval Status
This test is New York DOH approved.
Specimen Required
Patient Preparation:
Fasting specimen preferred.
Collect:
Serum separator tube or plasma separator tube. Also acceptable: Green (lithium heparin), lavender or pink.
Specimen Preparation:
Allow the specimen to clot completely at room temperature. Transfer 0.5 mL serum or plasma to a Standard Transport Tube. (Min: 0.5 mL)
Storage/Transport Temperature:
Refrigerated
Unacceptable Conditions:
Plasma or other body fluids. Contaminated, hemolyzed, grossly icteric, or grossly lipemic specimens.
Remarks:
Stability:
After separation from cells: Ambient: 24 hours; Refrigerated: 8 days; Frozen: 3 months (should not be thawed more than once)
Reference Interval
0-14 IU/mL
Interpretive Data
Note
CPT Code
86431
Components
Component Chart Name
Rheumatoid Factor
Component Test Code
0050465
LOINC
11572-5
Aliases

RA

RF

Rheumatoid Arthritis Factor

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