Autonomic Nerve Function Test

Autonomic testing, also known as autonomic reflex screen or autonomic response testing, is a non-invasive test that measures how the nervous system works to control blood pressure, heart rate and sweating. Autonomic testing is used to help physicians diagnose the presence and severity of dysautonomia, a disorder of the autonomic nervous system (ANS).

Why Do ANF Test?

Your physician may recommend autonomic testing if you’re experiencing symptoms like: 

  • Abnormal sweating
  • Dizziness
  • Fainting
  • Fatigue
  • Fluctuating blood pressure
  • Numbness and burning in your hands or feet
  • Rapid heart rate
  • Shortness of breath

Risks of autonomic testing

Some people may faint or collapse during the head-up tilt. When a patient’s symptoms and continuous recording of heart rate and blood pressure suggest pre-syncope (near fainting), the patient will be tilted back to a flat position immediately.

How to Preparation for Test.

To prepare for your autonomic test, please follow these instructions: 

  • If you are Medication. You will be asked to discuss your medications with your doctor. 
  • No nicotine (cigarettes) for eight (8) hours before the test. 
  • No caffeine (coffee, cola, energy drinks, tea, etc.) for eight hours before the test. 
  • No alcohol the evening before the test.
  • No medical or recreational marijuana.
  • Eat and drink normally for 24 hours prior to testing and make sure you are hydrated before your test.