Diagnosis. Diagnostic tests help verify the presence of nerve damage. The tests may also uncover unlaying health disorders contributing to the nerve conditions. An extensive review of the patient’s medical history, lifestyle, and the types of activities that may cause the symptoms and lead to nerve compression. A number of procedures can determine the health and function of the nerve. The tools used to diagnosis the level of nerve damage include electromyography (EMG) to tests the muscle movements. Nerve conduction measures electrical nerve impulses, magnetic resonance imaging (MRI), ultrasounds and X-rays provide images of tissue, bone, and organs.