£75.00
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Autoimmune and inflammatory disease testing.
The Rheumatoid Factor (RF) Test is a blood screening designed to detect the presence of rheumatoid factor antibodies, which are proteins produced by the immune system that can attack healthy tissues, often indicating autoimmune conditions like rheumatoid arthritis. This test helps identify inflammation and joint damage early, allowing for timely intervention to manage symptoms and prevent progression. Rheumatoid arthritis affects millions worldwide, causing chronic pain and disability, but early detection through RF testing can lead to better outcomes with treatments like anti-inflammatory medications or disease-modifying drugs.
Venous blood sample drawn
No fasting required
If you can’t find the test you’re looking for, simply give us a call and our support team will guide you to the right option. We’re here to ensure you get the correct test quickly and confidently.
This rheumatoid factor blood test measures one antibody, rheumatoid factor (RF). Clinicians often check it when joint pain, swelling or morning stiffness is being looked into. It is a single-marker test, not a full rheumatology panel.
An RF result on its own cannot confirm or rule out rheumatoid arthritis. It is read alongside your symptoms, an examination and, where needed, other blood tests or imaging.
People often book a private rheumatoid factor test when a GP or specialist has suggested it, when they want a result before an appointment, or when they want to recheck an earlier result. If you have hot, swollen joints, a fever or sudden severe pain, speak to a GP or NHS 111 first rather than waiting for a blood test.
The current price and the collection options for this test are shown in the booking area at the top of this page, so you see your total before you pay. Your results come with the laboratory reference range. If your result is outside that range, take it to your GP or specialist to discuss next steps.
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If you have been asked for RF specifically, this test is the right choice. If you want several related markers from one sample, compare these first:
It measures rheumatoid factor, an antibody that can attack the body's own tissues. This test reports RF only.
No. Many people with rheumatoid arthritis are RF positive, but RF is also found in some healthy people and in other conditions. A diagnosis is made by a clinician using your symptoms, an examination and other tests.
Yes. Some people have what is called seronegative rheumatoid arthritis, where RF is not raised. If your symptoms continue, a negative result should not stop you seeing your GP.
RF can be raised with older age, smoking, some long-term infections and other autoimmune conditions such as Sjögren's syndrome or lupus. This is why the result is always read in context.
Anti-CCP is another antibody that clinicians often check alongside RF, because it is more specific to rheumatoid arthritis. Ask your GP or specialist whether it would help in your case.
A low-level positive result is fairly common and does not mean you have a disease. Share it with your GP, who can decide whether anything else is needed.
No special preparation is usually needed for an RF test. Follow any instructions you are given when you book.
Not usually. RF levels do not reliably track how active rheumatoid arthritis is. Clinicians more often use inflammation markers such as CRP and ESR, plus your symptoms.
No. RF is an antibody test. Inflammation tests such as CRP and ESR show whether there is inflammation in the body, whatever the cause. They answer different questions and are often used together.
Take it to your GP or specialist. If you have persistent joint swelling, GPs are advised to refer people to a rheumatology specialist promptly, whatever the RF result.
Choose your collection method above and see your total before you pay.
Read All Our Google ReviewsGreat service. I’m not the best with needles, however, Jo made me feel comfortable and at ease which made the whole process much more tolerable. 5 stars from me.
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