Rheumatoid Factor
Test Code
RF
Description
Elevated RF is found in collagen vascular diseases such as SLE, rheumatoid arthritis, scleroderma, Sjogren's syndrome, and in other conditions such as leprosy, tuberculosis, syphilis, malignancy, thyroid disease and in a significant percentage of otherwise normal elderly patients.
Collect
Plain red top or SST tube.
Pediatric Collection
Minimum volume: 0.50 mL serum
Storage Transport Temp
Offsite: Send frozen serum Priority Overnight via FedEx and in a well insulated container on dry ice.
Stability
Stability after cell separation:
24 hours at RT (15-25°C )
8 days refrigerated 4-8°C
3 months frozen at ≤ -20°C
Performed
Mon-Fri
Methodology
Turbidimetric
Turnaround Time
4 hours
Department
Core Lab
Synonyms
Turbidimetric, Rheumatoid Factor, RF
Study Offerings
Not offered
Related Tests
Rheumatology/Arthritis, ANA pattern and titer (ANA), C-reactive protein (CRPLA), Anti-cyclic citrullinated peptide antibodies (CCP), Lyme disease Ab (MT), Erythrocyte sedimentation rate (ESR), Uric acid (URICX), CD20, pan B cells {Rituxan monitor} (CD20M), Anti-ds-DNA antobody (DNAC), Sjogrens antibody, anti SSA, anti SSB (SSAB/SSBB), Anti-Sci 70 antibodies (SCL70), Anti-neutrophil cytoplasmic Ab (CYNT), Myeloperoxidase Ab (MPOAB), Proteinase 3 Ab (PR3AB)
Reference Interval
|
Rheumatoid Factor |
Human |
|
|
Male |
Female |
|
|
IU/mL |
||
|
All Ages |
<14 |
<14 |
CPT Code
86431
New York Approved
FDA Approved or Cleared
FDA
Approved or Cleared