Which of the following is characteristic of a noninvasive diagnostic procedure?
A. It requires close monitoring of the patient because of the anesthesia.
B. A contrast medium is injected into a vein before the procedure.
C. It uses standard X-rays or ultrasound to view internal structures.
D. It requires the radiologist to insert a catheter or wire into a blood vessel or organ.
E. It requires surgical aseptic technique.
Answer: C
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