Arthritis Diagnosis - Diagnostic Tests for Arthritis - Blood TestsYour medical history, physical examination, imaging studies, and blood tests help diagnose arthritis, as well as what type of arthritis.Diagnosing Rheumatoid Arthritis - WebMD - Better information ...Diagnosing rheumatoid arthritis can be difficult. Find out how it's done.Blood Tests to Diagnose ArthritisWebMD describes the different blood tests used to diagnose arthritis and other inflammatory diseases.