QSART (Quantitative Sudomotor Axon Reflex Test)

The Quantitative Sudomotor Axon Reflex Test (QSART) is a diagnostic test used to measure the autonomic nervous system‘s ability to regulate sweating. It is particularly useful for evaluating sweat gland function and diagnosing conditions like diabetic neuropathy, autonomic neuropathy, and small fiber neuropathies.

Indications for QSART:

● Diabetic neuropathy: QSART helps assess autonomic dysfunction in patients with diabetes who are at risk of developing autonomic neuropathy.

● Peripheral neuropathies: Used to evaluate patients with unexplained symptoms like excessive sweating or dry skin in conditions like small fiber neuropathy.

● Assessment of autonomic dysfunction: Particularly useful in patients with conditions that may affect the autonomic nervous system, including Parkinson’s disease and multiple system atrophy.

How QSART Works:

The QSART measures the sweat response in specific areas of the skin, such as the forearm, hand, foot, and leg, after a chemical stimulant is applied. The amount of sweat produced is measured to evaluate nerve function in the sweat glands.

Normal Range:

● Normal results indicate appropriate sweat production in response to the chemical stimulant, reflecting healthy autonomic nervous system function.

Abnormal Test Significance:

● Reduced sweat production: Low levels of sweat indicate autonomic dysfunction, which could suggest diabetic neuropathy, autonomic neuropathy, or other underlying neurological conditions.

● Absence of sweat: Complete absence of sweat in response to the stimulant is a sign of significant nerve damage and may indicate advanced neuropathy.

Management Based on Results:

● For abnormal QSART results: Treatment focuses on managing the underlying cause, such as controlling blood sugar levels in diabetic neuropathy, and using medications like alpha-lipoic acid or nerve growth factors to improve nerve function.

Price in India:

Approx. ₹5,000 – ₹8,000 for a QSART test.