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What is autonomic testing? Autonomic testing helps find out if your autonomic nervous system (ANS) is working as well as it should. Your ANS controls body functions that happen automatically (without you thinking about them). These include breathing, heartbeat, body temperature, and digestion. If there are problems with the function of the ANS, it's known as autonomic neuropathy. The most common causes of autonomic neuropathy include diabetes, autoimmune diseases, some types of medicines, and certain infections, such as HIV/AIDS. Autonomic testing can show which part of the ANS is affected and how seriously it's affected. This can help your provider develop the most effective treatment strategy. Other names: tilt table test, quantitative sudomotor axon reflex test (QSART), thermoregulatory sweat test (TST) What is it used for? Autonomic testing is used to check for problems with your autonomic nervous system (ANS). Why do I need autonomic testing? You may need this test if you