Also known as: RhF
Rheumatoid factor (usually IgM) is present in approximately 70% of patients with RA and correlates with more severe disease. The presence of RF is not essential for the diagnosis of RA. RF also occurs in other autoimmune diseases (SLE, scleroderma, Sjogren's), and chronic bacterial infection. Rheumatoid factors are present in low titre in 5% of the normal population.
Specimen requirements
Serum 1ml
Cost
Price on application
Laboratory turnaround time
3 days
Laboratory method
Turbidimetry
Reference range/units
<30 IU/mL = negative
30-50 IU/mL = weak positive
>50 IU/mL = positive
Associated tests
Not applicable
Sample stability
2 weeks at 2-8ºC
Shipping and storage
UK and Ireland
Ambient temperature and first class post. Hays DX users please enquire via email below.
International
Ambient temperature if courier will deliver within 72 hours otherwise consider refrigerated transport. Freezing is not a requirement.
Ensure delivery Monday to Friday 09:00 - 17:30.
Further information and contact details
For further information, email immunologylab.enquiries@ouh.nhs.uk
