Which of the following diagnostic procedures is used to obtain cerebrospinal fluid for analysis?
A) nerve conduction velocity
B) lumbar puncture
C) positron emission tomography
D) cerebral angiography
B
Explanation: A lumbar puncture is a puncture with a needle into the lumbar area to withdraw fluid for examination and for the injection of anesthesia. A nerve conduction velocity test measures how fast an impulse travels along a nerve. Positron emission tomography uses positively charged isotopes to obtain an image of the brain. Cerebral angiography is an X-ray of the blood vessels of the brain after the injection of radiopaque dye.
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