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What is a Rheumatoid factor?
Michael Schiff, MD
University of Colorado School of Medicine, Denver, CO

Date Added: 05/01/13

A rheumatoid factor is a blood test that is a blood protein. This blood protein actually can become positive in many diseases. Actually, about 15 percent of people as they get older or more mature, that's over the age of 65 and that's getting younger by the day, can have a positive rheumatoid fact...
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Michael H. Schiff, MD, is the Medical Director of the Denver Arthritis Clinic Research Unit and Associate Clinical Professor of Medicine at the University of Colorado School of Medicine, Rheumatology Division.
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