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Rheumatoid factor
Test CodeRHEUMATOID FACTOR
Alias/See Also
RF
Chemistry
Chemistry
Preferred Specimen
Gold Top Tube
Minimum Volume
2 mL
Transport Temperature
Refrigerate
Specimen Stability
Room temperature (20 to 25°C): 1 day
Refrigerated (2-8°C): 3 days
If testing will be delayed longer than the maximum room temperature/2 to 8°C storage time, remove serum from the clot or separator gel and store frozen.
Refrigerated (2-8°C): 3 days
If testing will be delayed longer than the maximum room temperature/2 to 8°C storage time, remove serum from the clot or separator gel and store frozen.
Methodology
Turbidimetric/Immunoturbidimetric
Setup Schedule
M-F
Report Available
TAT 1 - 2 days
Reference Range
0-15 IU/mL
Clinical Significance
Elevated RF is found in collagen vascular diseases such as SLE, rheumatoid arthritis, scleroderma, Sjögren's Syndrome, and in other conditions such as leprosy, tuberculosis, syphilis, malignancy, thyroid disease and in a significant percentage of otherwise normal elderly patients.
Performing Laboratory
Test performed at West Roxbury Chemistry Lab
Contact: Jonathan Dryjowicz-Burek 857-203-5973
Last Updated: November 25, 2025
