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Rheumatoid Factor by Turbidimetry, Synovial Fluid (RDL)
Test Code901708
CPT Codes
86431
Preferred Specimen
1 mL synovial fluid collected in a plastic, screw-cap vial
Minimum Volume
0.3 mL
Instructions
Collect synovial fluid aseptically into tube or other container.
Note: Minimum volume does not allow for repeat testing.
Note: Minimum volume does not allow for repeat testing.
Transport Temperature
Refrigerated (cold packs)
Specimen Stability
Room temperature: 7 days
Refrigerated: 14 days
Frozen: 60 days
Refrigerated: 14 days
Frozen: 60 days
Reject Criteria (Eg, hemolysis? Lipemia? Thaw/Other?)
Gross hemolysis • Bacterial contamination • Lipemia • Icteric • Non-synovial body fluids
Methodology
Turbidimetric
Setup Schedule
Set up: Daily; Report available: 7-14 days
Reference Range
See Laboratory Report
Clinical Significance
The most consistent serologic finding in patients with Rheumatoid Arthritis is an increase in the concentration of RF IgM in blood and synovial fluid. RF by Turbidimetry is 95% IgM.
