Jan 18, 2024 · Providers usually measure rheumatoid factor as a number that says how many units of RF are in each milliliter of your blood (U/mL). A normal, healthy amount of rheumatoid …

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 …

Dec 20, 2025 · Rheumatoid factor (RF) is present in about 80% of people with rheumatoid arthritis (RA). Learn how the test is performed and what RF test results mean.

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. While high RF levels can …

Aug 26, 2023 · Rheumatoid factors are proteins made by your immune system that can attack healthy tissue in the body. High levels of rheumatoid factor in the blood are most often related …

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.

This blood test measures rheumatoid factors. High levels of rheumatoid factors may be a sign of rheumatoid arthritis or another autoimmune disease. Learn more.

Sep 4, 2024 · When rheumatoid factor is in your bloodstream, it will help your doctor know if you have rheumatoid arthritis and how severe it is. The test also helps your doctor tell the …

Rheumatoid factor is a blood test that helps to diagnose rheumatoid arthritis, lupus, and sarcoidosis. Elevated test results, or high levels, indicate severe disease.

Jul 10, 2025 · “Rheumatoid factors are usually measured in units per milliliter, and different laboratories may have somewhat different reference ranges. Many laboratories consider RF …