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Rheumatoid Factor (IgG) [15683]
MessageFor Specimen Integrity during Extreme Weather see the “Lockbox Usage in Extreme Weather” document at the top of this page.
Test Code
RFIGG
Alias/See Also
15683
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 • Gross lipemia • Grossly icteric • Heat treated samples • Serum separator tube (SST®)
Methodology
Immunoassay (IA)
Setup Schedule
Set up: Tues, Sat; Report available: Next day
Reference Range
≤6 U | Negative |
>6 U | Positive |
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.
Performing Laboratory
Quest Diagnostics Nichols Institute
14225 Newbrook Drive
Chantilly, VA 20153
Last Updated: December 6, 2021