RF
Preferred Sample Type
Suitable Specimen Types
- Serum
5-10 mL
Sample Processing in Laboratory
Usual
Sample Preparation
Centrifuge
Turnaround Time
1 daySample Stability
Stored at 4oC
Rheumatoid Factor (RF)
General Information
Rheumatoid factor is a significant serological marker of rheumatoid arthritis and can occur in 50 -90% of patients with RA, however, 2-10 % of apparently healthy adults have been shown to have a positive rheumatoid factor and Rheumatoid factors can oocur in up to 50% of patients with infection.
Patient Preparation
None
Notes
This method is suitable for serum samples only.
Reference Range
Up to 30 IU/mL = Negative
30-50= Weak Positive
Greater than 50 IU/mL = Positive
Specifications
- EQA Scheme?: Yes
-
EQA Status:
UK NEQAS scheme for general autoimmune serology.