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About These Tests

Autonomic Function Testing
This test includes four separate studies. The first three involve continuous heart rate and blood pressure responses to individual tasks. The heart rate and blood pressure are recorded with electrodes applied to your chest and wrist. The fourth part of the exam involves measuring how much sweat your body produces. Small recording devices are placed onto your forearm, leg and foot. These devices measure your sweat production in response to a very tiny electrical stimulus.

How to Prepare

Bring a list of all your medications when you come in for testing.

For 24-48 hours before the test, do not take the following medications (consult with your primary care physician before stopping any medication):

  • Anticholinergic medication, like antidepressants, antihistamines, and cold remedies
  • Florinef
  • Diuretics, such as Lasix
  • Sympathomimetics or parasympathomimetics
  • Alpha or Beta antagonists

For four hours before the test, do not eat or smoke, and do not drink alcohol or caffeine.

Thirty minutes before the test: Stay inside for half an hour before the test.

During the test: Do not wear Ted or Jobst stockings.

What to Expect

There may be minimal discomfort with the sweat exam, but the other three tests are painless. The test takes about 90 minutes, but plan for two or three hours for the full appointment. You will be lying down for all phases of testing.


Tilt table weight requirements: Minimum of 35 lbs, maximum 350 lbs.

Only the patient is allowed in the procedure room during the testing.

Minor children under the age of 13 can have only one parent/guardian accompany them in the lab for the testing.

No cell phones, photos or video recording allowed.

After Your Test

We will send test results to your referring doctor within three to five business days.