Guided Brain Stem Response (GBSR) or Brainstem Auditory Evoked Potential (BAEP) with Mass Concentration Measurement

What This Test Measures

The test uses small electrodes placed on your ears and scalp to detect electrical signals generated by your brainstem in response to rapid sound pulses. It captures the timing and strength of these responses, which are recorded and analyzed to identify any delays or abnormalities.

Why It’s Done

A brainstem auditory evoked response (BAEP) test is typically performed when doctors suspect hearing problems, brainstem injuries, or conditions like multiple sclerosis, stroke, or tumors affecting the brainstem. It may also be used before surgeries involving the brain or spinal cord.

How It’s Performed

You’ll lie down on a comfortable bed while electrodes are attached to your ears and scalp. Tiny electrical signals are sent through your ears via earphones, and the test measures the brain’s response to these signals. The process is painless and usually takes about 20–30 minutes.

What to Expect Before the Test

No special preparation is needed, but you may be asked to remove any jewelry or clothing covering your ears and scalp. Wear loose clothing and avoid lotions or oils on your skin in the testing area. If you’re taking medications, inform your doctor beforehand.