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RHEUMATOID FACTOR (RF), SERUM
Test CodeLAB304708
CPT Codes
86431
Preferred Specimen
5 mL Gold top tube
Minimum Volume
2 mL blood
Required for testing: 1 mL serum
Required for testing: 1 mL serum
Other Acceptable Specimens
Red top tube
Instructions
Sample must be centrifuged within two hours of collection. Serum must be removed from the red cells and put into aliquot tubes following centrifugation.
Avoid freeze-thaw cycling.
Avoid freeze-thaw cycling.
Transport Temperature
Refrigerated
Specimen Stability
Ambient: 24 hours
Refrigerated: 3 days
Frozen: 1 month
Refrigerated: 3 days
Frozen: 1 month
Reject Criteria (Eg, hemolysis? Lipemia? Thaw/Other?)
Turbid or lipemic specimens
Methodology
Immunoturbidimetric
Reference Range
<13 - 30 IU/mL
Clinical Significance
Test useful for diagnosis and prognosis of rheumatoid arthritis (RA).
RF may be present in patients with other connective tissue diseases. A negative RF test does not excude RA. Patients with cryogrobulinemia or hyperlipidemia may have falsely positive RF results.
RF may be present in patients with other connective tissue diseases. A negative RF test does not excude RA. Patients with cryogrobulinemia or hyperlipidemia may have falsely positive RF results.
Performing Laboratory
West Virginia University Hospital, Inc.
Camden Clark Medical Center Garrett Regional Medical Center Reynolds Memorial Hospital St. Joseph’s Hospital United Hospital Center Uniontown Hospital Wheeling Hospital
