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Also known as: RA Latex, Turbidimetry, RF Titer.

The rheumatoid factor (RF) test is mostly used to help in diagnosing rheumatoid arthritis (RA) and distinguishing it from other forms of arthritis and other conditions that cause symptoms of joint pain, stiffness, and inflamation. Symptoms may include swelling, warmth, pain, morning stiffness in the joints, and nodules under the skin. If the disease has progressed, evidence will be on X-rays of swollen joint capsules and loss of bone and cartilage. An RF test may be repeated whenever the first test is negative and symptoms persist. The RF test also may be ordered if a patient has symptoms suggesting Sjögren’s syndrome.