Rheumatoid Arthritis: Diagnosis & Test - WebMD - Better ...Diagnosing rheumatoid arthritis involves everything from a doctor’s exam and blood tests to X-rays and MRIs. Read about diagnosing RA and juvenile rheumatoid arthritis.Arthritis Diagnosis - Diagnostic Tests for Arthritis - Blood TestsArthritis Diagnosis - Diagnostic Tests for Arthritis - Blood Tests ... 80% of adults with rheumatoid arthritis test positive for rheumatoid factor ...Diagnostic Tests For Rheumatoid Arthritis | LIVESTRONG.COMDiagnostic Tests For Rheumatoid Arthritis. Although rheumatoid arthritis RA diagnosis typically requires careful observation of symptoms by a physician to discern RA ...