Rheumatoid factor is one of the most accurate ways to test for RA. But is it always positive? Take a look at this video to find out more.
Transcript: A HIGH RF factor is less common at the start of rheumatoid arthritis, and it can increase as the disease develops. About TWENTY percent of people with rheumatoid arthritis will PERSISTENTLY test negative for rheumatoid factor. This doesn’t mean they DON’T have the disease—they will often display all the traditional symptoms such as joint pain, morning stiffness and swelling. Other blood tests, such as an anti-CCP test, may assist healthcare providers in diagnosis when a person has a negative RF test. More »