Table of Contents
Morning stiffness in and around the joints, lasting at least 1 hour before maximal improvement.
At least 3 joint areas (out of 14 possible areas, right or left proximal interphalangeal, metacarpophalangeal, wrist, elbow, ankle, metatarsophalangeal joints), simultaneously have had soft tissue swelling or fluid (not bony overgrowth alone) as observed by a physician.
At least 1 area swollen (as defined above) in a wrist, metacarpophalangeal, or proximal interphalangeal joint.
Simultaneous involvement of the same joint areas (as defined in criterion 2) on both sides of the body(bilateral involvement of proximal interphalangeal, metacarpophalangeal, or metatarsophalangeal, without absolute symmetry, is acceptable)
Subcutaneous nodules over bony prominences or extensor surfaces, or in juxta-articular regions as observed by a physician.
Demonstration of abnormal amounts of serum rheumatoid factor by any method for which the result has been positive in less than 5% of normal control subjects.
Radiographic changes typical of rheumatoid arthritis on posteroanterior hand and wrist radiographs, which must include erosions or unequivocal bony decalcification localized in, or most marked adjacent to, the involved joints (osteoarthritis changes alone do not qualify)
The 1987 American Rheumatism Association Revised Criteria for the Classification of Rheumatoid Arthritis Patients having at least four of these seven criteria (One to four at least 6 weeks) can be classified as having rheumatoid arthritis. These criteria distinguish rheumatoid arthritis from other forms, with a specificity of 89% and a sensitivity of about 94%.