Finding the right tests…
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Finding the right tests…
Hormonal
Anti-CCP antibodies target citrullinated proteins your immune system mistakes for a threat, and their presence is one of the more specific signs of rheumatoid arthritis on a blood test. Your doctor usually orders this alongside a rheumatoid factor test when you have joint pain, swelling, or stiffness lasting more than a few weeks, especially affecting both sides of your body. Anti-CCP can show up years before joint damage appears on an X-ray, and unlike rheumatoid factor, it's rarely positive in people without RA. One large review found anti-CCP specificity around 95%, well above rheumatoid factor's typical 79-87%. A negative result doesn't rule out RA — around three in ten people with confirmed RA test negative for both markers.
This test measures antibodies in your blood that target citrullinated peptides, reported as a titre or a numeric unit value depending on the lab's assay. A standard blood draw is all that's required, with no special preparation. Results are usually read alongside a rheumatoid factor test and your joint symptoms, rather than as a number on its own, since assay cutoffs for a positive result differ between labs and between anti-CCP generations, such as CCP2 versus CCP3. Ask your doctor which assay the lab used and how your specific result compares to their reference cutoff.
Rheumatoid arthritis begins when your immune system starts treating your own joint tissue as foreign, and one particular target is a group of proteins that have undergone a chemical change called citrullination. Anti-CCP antibodies are built against exactly that changed protein, which is part of why they're a more targeted signal of RA than older markers.
Rheumatoid factor, the older standard test, also shows up in other autoimmune diseases, chronic infections, and even in some people with no disease at all, which limits how much it can tell you by itself. Anti-CCP doesn't have that same problem — it's rarely positive outside of RA, so when it is positive alongside joint symptoms, it carries real diagnostic weight.
Because anti-CCP antibodies can appear years before joint damage shows up on an X-ray, an early positive result can prompt earlier treatment, which matters for preventing permanent joint damage. Doctors often order it together with rheumatoid factor rather than alone, since testing positive for both narrows the diagnosis further than either test on its own.
- More specific to RA than rheumatoid factor - Can appear before visible joint damage - Usually ordered alongside rheumatoid factor, not alone
A positive anti-CCP result is one of the more specific signs of rheumatoid arthritis, meaning it's uncommon in people who don't have RA. It doesn't confirm the diagnosis by itself — your doctor combines it with your joint exam, symptoms, and other blood tests.
Yes. Around three in ten people with confirmed RA test negative for both anti-CCP and rheumatoid factor, according to a systematic review in the NCBI literature, so a negative result doesn't rule out the disease.
Anti-CCP is generally more specific to RA than rheumatoid factor, meaning fewer false positives from other conditions. One NCBI-reviewed meta-analysis found anti-CCP specificity around 95%, compared with roughly 79 to 87% for rheumatoid factor, though sensitivity is fairly similar between the two.
This page is general information about the test, not medical advice. Your own report's reference ranges apply — please discuss your results with your doctor.
Research summarised in the NCBI literature shows anti-CCP antibodies can appear years before visible joint damage, and in some people before symptoms start, which is part of why it's useful for early detection.
Higher anti-CCP levels have been linked to a greater risk of more erosive, joint-damaging disease in some studies, but your doctor uses this alongside imaging and clinical exams to judge severity, not the titre alone.
No specific fasting requirement is described for this test, but ask your doctor or the centre when you book, since practice can vary.
It's mainly a diagnostic test rather than one used to track day-to-day treatment response — doctors typically follow disease activity through symptoms, joint exams, and inflammatory markers instead. Ask your doctor if repeat anti-CCP testing applies to your situation.