Diagnosis of the cause of joint pain starts with a medical history and physical exam. This may be all that is needed to make the diagnosis in some cases. In other cases, more tests may be needed. Different tests may be ordered, depending on the suspected cause.
Blood tests are often used to help diagnose infections, autoimmune disorders, and metabolism problems. Joint X-rays of the affected area are also common.
A joint aspiration can be helpful in detecting abnormal cells or deposits in the joints. A needle is inserted through the skin and into the affected joint. A sample of joint fluid is then removed with the needle. The fluid can be sent to the lab for further examination and testing. This procedure can be used to help diagnose septic arthritis, gout, pseudogout, and other conditions.