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Rheumatoid Factor (IgG)
Test Code15683
CPT Codes
83520
Preferred Specimen
1 mL serum collected in a red-top tube (no gel)
Patient Preparation
Overnight fasting is preferred
Minimum Volume
0.3 mL
Transport Temperature
Refrigerated (cold packs)
Specimen Stability
Room temperature: 48 hours
Refrigerated: 8 days
Frozen: 28 days
Refrigerated: 8 days
Frozen: 28 days
Reject Criteria (Eg, hemolysis? Lipemia? Thaw/Other?)
Gross hemolysis • Grossly lipemic • Grossly icteric • Heat treated samples • Serum Separator Tube (SST®)
Methodology
Immunoassay (IA)
Setup Schedule
Evening Sets up 2 days a week.
Report Available
Reports in 1 day.
Clinical Significance
In conjunction with clinical findings and other laboratory tests, the presence of rheumatoid factor (RF) can be used to aid in the diagnosis of rheumatoid arthritis.