A GI series uses:
A) barium to visualize the stomach and intestines.
B) ultrasound to show the size of the colon.
C) fiberoptic instrument to see the inside of the stomach.
D) a sample of blood to test the function of the stomach.
A
Explanation: A) Correct. Barium is swallowed by the patient and a series of x-rays are taken.
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