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A B C D E F G H I J K L M N O P Q R S T U V W X Y Z # |
Rheumatoid Factor (IgA)
Test Code15682
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: 1-4 days
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.