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 …

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 factor is less …

Aug 20, 2025 · The typical range for RF is usually 0–20 units per milliliter (U/ml) of blood. A person’s risk of developing rheumatoid arthritis typically increases with their RF level and the presence of ...

The "normal" range (or negative test result) for rheumatoid factor is less than 14 IU/ml. Any result with values 14 IU/ml or above is considered abnormally high, elevated, or positive.

Oct 16, 2025 · Antibodies directed against the Fc fragment of immunoglobulin G (IgG) are called rheumatoid factors (RFs). They are heterogenous and usually composed of immunoglobulin M (IgM).

Dec 12, 2018 · Most medical centers consider the normal range of rheumatoid factor to be up to 10 IU/mL or 20 IU/mL, says rheumatologist Steffan Schulz, MD, assistant professor of clinical medicine …

Aug 26, 2023 · But rheumatoid factor may be detected in some healthy people. And sometimes people with autoimmune diseases have normal levels of rheumatoid factor. A rheumatoid factor test is one …

Dec 20, 2025 · The normal range for a rheumatoid factor test can vary a bit between laboratories, but generally speaking, your rheumatoid factor level should be around: 9 Value: Less than 15 IU/ml

Dec 11, 2025 · While RF below 20 IU/mL is considered normal, levels between 20-40 IU/mL require monitoring, and anything above 60 IU/mL demands comprehensive evaluation by a rheumatologist. …

Dec 31, 2025 · There are two ways in which the normal rheumatoid factor range can be presented. Titer: Below 1:80 (1 to 80) titer. Units: Below 40-60 units per milliliter (U/Ml) Notes: A titer is a measure of …