Jan 18, 2024 · A rheumatoid factor test is a simple blood draw your healthcare provider may use to help diagnose autoimmune diseases like rheumatoid arthritis and Sjögren’s syndrome.

A rheumatoid factor (RF) test checks a sample of your blood for rheumatoid factor, a protein made by the immune system. Normally, your immune system makes proteins called antibodies to attack …

Aug 26, 2023 · A positive rheumatoid factor test result shows that you have a high level of rheumatoid factor in your blood. A higher level of rheumatoid factor in your blood is closely linked with …

Dec 20, 2025 · A rheumatoid factor (RF) test is a blood test that can help diagnose rheumatoid arthritis (RA). The test measures the amount of rheumatoid factor in your blood. Rheumatoid factor is an …

Rheumatoid factor is a blood test that helps to diagnose rheumatoid arthritis, lupus, and sarcoidosis. Elevated test results, or high levels, indicate severe disease. Learn about the normal range for …

May 4, 2025 · A rheumatoid factor (RF) blood test can help detect rheumatoid arthritis and Sjögren syndrome. You may need it if you have symptoms like joint pain and fatigue.

RF Test: What is the Normal Range for a Rheumatoid Factor Test? The rheumatoid factor is an antibody present in the blood of many patients with rheumatoid arthritis. Doctors measure the level of …

Sep 4, 2024 · What Is the Rheumatoid Factor Test? A rheumatoid factor test, or RF test, is a blood test to look for rheumatoid factors in your blood.

Aug 20, 2025 · Rheumatoid factor (RF) is an immune system protein that attacks healthy cells. An RF test is a blood test that can help diagnose rheumatoid arthritis.

A test for rheumatoid factor is done to help support a diagnosis of rheumatoid arthritis. This test is also done to find out whether a child who has polyarticular juvenile idiopathic arthritis has elevated …