Diagnostic tests, while not necessary for the diagnosis of RA, are useful in confirming the diagnosis, ruling out other diagnoses, monitoring the progression of the disease, and evaluating the response to treatment.[4] The American College of Rheumatology Subcommittee on Rheumatoid Arthritis (ACRSRA) recommends that baseline laboratory evaluation include a complete blood cell count with differential, rheumatoid factor (RF), and erythrocyte sedimentation rate or C-reactive protein.[4] The patient's hepatic and renal function should also be evaluated and a baseline established because these levels will help guide treatment choices. It is also important to obtain baseline X-rays of the hands, feet, and other affected joints for comparison when assessing disease progression.[5]