Which priority instruction or precaution does the nurse teach a client who is scheduled for a positron emission tomography scan of the brain?
a. "Avoid caffeine-containing substances for 12 hours before the test."
b. "Drink at least 3 liters of fluid during the 24 hours after the test."
c. "Do not take your cardiac medication on the morning of the test."
d. "Remove your dentures and any metal before the test begins."
A
Caffeine-containing liquids and foods are central nervous system stimulants and may alter the test results. No contrast is used; therefore the client does not need to increase fluid intake. The test does not require MRI, so metal does not have to be removed. The client should take cardiac medications as prescribed.
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