FaridabadBy Dr B.C. Gupta, MD · 2026-11-01
Rheumatoid arthritis is a long-term condition in which the body's immune system attacks the lining of the joints. It usually causes pain, swelling and stiffness, most often in the small joints of the hands and feet, and it tends to affect both sides of the body. Blood tests are used alongside examination and imaging to support the diagnosis and to see how active the condition is.
RA factor
RA factor, or rheumatoid factor, is an antibody that is found in many people with rheumatoid arthritis. RA factor is still requested regularly alongside the newer anti-CCP test. It is not specific: RA factor can be present in other autoimmune conditions, in some long-term infections, and in a small number of healthy people, especially older adults. A negative result does not rule out rheumatoid arthritis either, because a proportion of people with the condition do not have it.
Anti-CCP: the more specific test
Anti-CCP, short for anti-cyclic citrullinated peptide antibody, is a newer test. It is more specific for rheumatoid arthritis than RA factor, which means a positive result is more likely to point to this condition rather than something else. Anti-CCP can also appear early, sometimes before the joints are visibly affected, and a positive result is associated with a more persistent form of the disease. Because of this it is often requested together with RA factor rather than instead of it.
ESR and CRP
ESR and CRP are markers of inflammation rather than tests for rheumatoid arthritis itself. They do not diagnose the condition, but they are useful for showing how much inflammation is present and for following how it changes over time. A doctor may repeat them to see whether treatment is bringing the inflammation down.
How to prepare
The RA factor and anti-CCP tests use a blood sample drawn from a vein in the arm. No fasting is needed for these tests. If you already take medicine for joint symptoms, tell the centre what you take, because some treatments can affect the results.
What a result does and does not mean
No single blood test confirms or excludes rheumatoid arthritis. The diagnosis is made by a doctor who puts together your symptoms, the pattern of joints affected, the examination findings, and the test results. A positive RA factor in someone with no joint symptoms does not mean they have the disease, and a negative anti-CCP does not rule it out. If your doctor has asked for these tests, call the centre to confirm preparation and timing before you visit.
This article is for general information only and is not medical advice. Always discuss your results and any health concerns with your doctor.
