A patient who takes sodium bicarbonate is scheduled for gastric acid analysis. For how many hours before the test should the drug be withheld?
a. 24 hours
b. 16 hours
c. 12 hours
d. 8 hours
ANS: A
Sodium bicarbonate antagonizes the effects of pentagastrin and histamine during testing of gas-tric acid secretion and should be withheld for 24 hours preceding the test.
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