What are the tests required to diagnose joint pain?

The two most likely causes of multiple joint pains in this age group are either degenerative (wear and tear) or inflammatory (such as Rheumatoid arthritis etc). She should have a full blood count, ESR, CRP to start with. If these tests are suggestive of inflammatory process, further tests should be organised in consultation with the treating Rheumatologist/Orthopaedic doctor.