R.A. Rheumatoid Arthritis test

Rheumatoid diseases

Sample	Fresh serum
Schedule	Daily
Units	IU/mL
Range	R.A., IU/mL  Up 25 Negative  25 - 50 Weak  50 - 100  Increased    > 100 Strong
Remarks	RA Test (RF Rheumatoid factor) is used in the differential diagnosis of rheumatoid arthritis and related diseases. About 80% of patients with clinically suspected rheumatoid arthritis have positive RA test, whereas seropositive cases are more serious than seronegative ones. Some rheumatoid arthritis patients with negative RA test will be positive for Anti CCP test. RA test may be positive in other than rheumatoid arthritis cases: patients with SLE, hepatitis, syphilis, cirrhosis of the liver.