Your doctor usually can diagnose diabetic neuropathy based on your medical history, symptoms and the results of a physical examination. When necessary, more specialized testing may be done, such as:
Nerve conduction studies to check whether nerve impulses in the arms and legs are normal, and a test called electromyography to see how well arm and leg muscles move in response to nerve signals. These two tests usually are done together. They involve a series of momentary minor electric shocks through small needles or pads on the skin.
Ultrasound scan of the urinary bladder or drainage of the bladder through a catheter to evaluate how efficiently your bladder empties.
Gastric (stomach) emptying study to test how quickly food moves through your stomach. In this test, you eat food, such as scrambled eggs, that has been marked with radioactivity. A series of pictures is taken by a machine that detects the radioactive signal.
Nerve biopsy, which involves taking a small sample of a nerve to be examined under a microscope.
Peripheral and autonomic neuropathies are usually long-term problems, but most cases of focal neuropathy last only a few weeks or months.