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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.
Serum or plasma - 1ml
Price on application
3 days
Turbidimetry
<30 IU/mL = negative
30-50 IU/mL = weak positive
Not applicable
2 weeks at 2-8ÂșC
Ambient temperature and first class post. Hays DX users please enquire via email below.
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.
For further information, email immunology.office@nhs.net