Osteoarthritis is typically diagnosed with a complete medical history, including a description of your symptoms, and physical examination. Imaging techniques — such as X-rays or magnetic resonance imaging (MRI) — are sometimes used to show the condition of the joints. If other types of arthritis are suspected, laboratory tests on blood, urine, and/or joint fluid may be helpful in determining the type of arthritis. These tests also can help rule out other diseases as the cause of your symptoms.