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.
Ask your doctor if you should have an RF test and what your test results mean. Rheumatoid Factor Test FAQs What should your rheumatoid factor level be? A normal RF test result is under 20 units per milliliter of blood. What does it mean when your rheumatoid factor is positive? If your ...
Rheumatoid Factor Test Results Receiving test results Results are normally available within a few business days of taking an RF test. They may be shared with you via phone, mail, or electronically. In some cases, doctors may wait to share the results of RF testing until other testing is comp...
Rheumatoid factor testing in 8,287 rheumatic disease patients. Arthritis Rheum. 1991 Aug; 34 (8):951–960. [ PubMed ]Wolfe F, Cathey MA, Roberts FK. The latex test revised rheumatoid factor testing in 8,287 rheumatic disease patients. Arthritis Rheum 1991; 34:951-60....
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Rheumatoid factor Rheumatoid factors (RF) are primarily IgM antibodies directed against the Fc part of the patient's own IgG molecules.4 Although 80% of patients with rheumatoid arthritis are RF positive, these antibodies are not specific for rheumatoid arthritis, occurring in a wide range of auto...
RESULTS--Amongst symptomatic infants with congenital syphilis the FTA-ABS (IgM) test was positive in 34 (92%) of 37 cases prior to abolishing the RF effect and in 29 (78.4%) of 37 cases afterwards (p = 0.19). In 12 cases of congenital syphilis who were asymptomatic at birth, 10 had...
Results The RA group had significantly lower standardized femoral cortical thickness at the anterior and medial distal diaphysis than healthy controls. Standardized proximal lateral and central lateral in the RA group were significantly larger than those in the healthy control groups. Standardized femoral...
Doctors look at your symptoms and certain test results to determine whether you have RA. This is called the diagnostic criteria. You can have RA without meeting each of the criteria. They are: Inflammatory arthritis in two or more large joints, such as ankles, knees, hips, shoulders, and ...
The diagnosis of rheumatoid arthritis relies mostly on the experience and judgment of the doctor, and is based on the "big picture" of symptoms, examination and test results. The diagnosis also depends on excluding other explanations for the symptoms....