Question

which of the following diagnostic tests measures how fast an impulse travels along a nerve?
a nerve conduction velocity
b lumbar puncture
c positron emission tomography
d cerebral angiography

Explanation:

• Nerve conduction velocity (NCV) is a test that measures the speed of an electrical impulse as it travels along a nerve.
• A lumbar puncture (spinal tap) is used to collect cerebrospinal fluid for analysis, not to measure nerve impulse speed.
• Positron emission tomography (PET) is an imaging test that shows how the body is functioning, such as metabolic activity in the brain, not nerve impulse speed.
• Cerebral angiography is an imaging test used to visualize the blood vessels in the brain, not related to nerve impulse speed.

Answer:

A. nerve conduction velocity