Blood Tests for Arthritis: RF, Anti-CCP, ESR, CRP and HLA-B27 Explained
Short answer: No single blood test can diagnose arthritis. Doctors combine your symptoms, an examination of your joints and blood tests, sometimes with imaging. The main tests are RF and anti-CCP (rheumatoid arthritis), ESR and CRP (inflammation), HLA-B27 (spondyloarthritis) and uric acid (gout). A normal result does not always rule arthritis out.
The main arthritis blood tests
| Test | What it looks for | Useful for |
|---|---|---|
| RF (rheumatoid factor) | An antibody found in many people with rheumatoid arthritis | Rheumatoid arthritis |
| Anti-CCP | An antibody that is more specific to rheumatoid arthritis | Rheumatoid arthritis, outlook |
| ESR and CRP | General markers of inflammation | Showing inflammation, tracking treatment |
| HLA-B27 | A gene variant linked with spondyloarthritis | Ankylosing spondylitis, inflammatory back pain |
| ANA | Antibodies against cell nuclei | Lupus and related diseases |
| Uric acid | Urate level in the blood | Gout, monitoring treatment |
| CBC, liver and kidney tests | Blood counts and organ function | Safety checks on arthritis medicines |
RF and anti-CCP for rheumatoid arthritis
Rheumatoid factor is positive in many, but not all, people with rheumatoid arthritis, and it can also be positive in healthy older people and in other conditions. Anti-CCP is more specific, so a positive result carries more weight, and it can appear years before symptoms. Having both positive usually means more active disease that needs early treatment. About a quarter of people with rheumatoid arthritis test negative for both, which is called seronegative arthritis. Read our page on rheumatoid arthritis.
ESR and CRP: signs of inflammation
CRP rises quickly with inflammation; ESR changes more slowly and also rises with age and anaemia. Raised values show that something is inflaming the body, but not what. Infections and injuries raise them too. They are most useful for tracking disease activity after diagnosis.
HLA-B27 for back pain in younger people
Most people with ankylosing spondylitis carry HLA-B27, but so do some healthy people, so a positive result supports the diagnosis only when the symptoms fit. It is a genetic test, so it only needs to be done once. See inflammatory back pain.
Uric acid for gout
A high uric acid level raises the risk of gout, but many people with high levels never get gout, and the level can be normal during an attack. The diagnosis is confirmed by finding urate crystals in joint fluid. Uric acid is mainly used to monitor treatment. See normal uric acid ranges by age.
Why a normal blood test does not mean “no arthritis”
- Early arthritis can have normal blood tests.
- About one in four people with rheumatoid arthritis is seronegative.
- Osteoarthritis and many other causes of joint pain do not show up in blood tests at all.
That is why diagnosis depends on examination and your history first. See when to see a rheumatologist.
How to prepare for the tests
Most arthritis blood tests need no fasting. Tell the laboratory about your medicines, bring your doctor’s prescription, and ask for the report to be sent to your rheumatologist. Immunix Labs offers these tests at OARC Saheed Nagar, OARC Sailashree Vihar and at home.
Frequently asked questions
Which blood test confirms rheumatoid arthritis?
None on its own. Anti-CCP and RF support the diagnosis, but doctors also rely on joint swelling, the pattern of joints affected and the duration of symptoms.
My RF is positive but I have no joint pain. Do I have arthritis?
Not necessarily. A positive RF can occur in healthy people, in older age and in some infections. A doctor needs to look at your symptoms before drawing conclusions.
Can I test for arthritis at home?
You can have blood collected at home for the tests, but the results need a doctor’s interpretation, and the diagnosis needs an examination.
Book an appointment
You can book online at OARC Saheed Nagar or OARC Sailashree Vihar in Bhubaneswar, or call or WhatsApp +91 93386 53086. OARC Saheed Nagar is open Monday to Saturday, 9:00 AM–2:00 PM and 4:30–9:00 PM. OARC Sailashree Vihar is open Monday to Saturday, 8:00–9:00 AM and 5:00–6:00 PM. Both are closed on Sunday. Tests ordered at your visit can be done at our in-house laboratory, Immunix Labs, with sample collection at both centres and at home.
Sources
- NICE guideline NG100: Rheumatoid arthritis in adults
- NICE guideline NG65: Spondyloarthritis
- NHS: Rheumatoid arthritis
Medical review: Dr. Jyoti Ranjan Parida, DM (Rheumatology), review pending. This article is general information and not a diagnosis. See our editorial policy.
