Also referred to as a QSART, the Quantitative Sudomotor Axon Reflex Test measures the nerves that control sweat. By evaluating specific areas for sweat response to stimuli, assessments can be made for any potential deficits or abnormalities. This test is helpful when trying to diagnose autonomic nervous system disorders and peripheral neuropathies.

Acetylcholine, a naturally occurring chemical, is used to stimulate your sweat glands during the test; the resulting volume of sweat produced by this stimulation is measured by the QSWEAT. Using electrodes, small, painless electrical currents are passed through the forearms, foot, and leg. A computer will then analyze how your nerves and sweat glands react.

A trained technician will be conducting your QSWEAT, which lasts 30-minutes.

You will be asked to remove one shoe and sock before laying flat on an exam table. Four electrodes containing acetylcholine (the naturally occurring chemical used to stimulate sweat) will be placed on you, one on your wrist and three along your leg. The electrodes are connected to a computer which will produce small amounts of electrical current to stimulate and record your body’s response.

The QSWEAT is a safe and relatively painless procedure. If you do experience any discomfort during the test, please inform the technician right away.

Results of a QSWEAT are available seven days after testing and will be reviewed at your next follow up visit.

Wear loose fitting clothing that will allow access to your forearm and legs. You can also bring a pair of shorts to change into prior to the appointment.

Do not use lotions, oils, or creams on your arms or legs prior to your appointment.

Do not wear any hair extensions, weaves, or wigs.

Do not take any over-the-counter cold or cough medications, aspirin, antihistamines, antidepressants, or diuretics 48 hours prior to your scheduled test. If you have any concerns about discontinuing your medication, please discuss this with your provider prior to your test date.