A preferred and highly accurate method of diagnosing hypertrophic pyloric stenosis is:

A

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A Correct. A preferred and highly accurate method of diagnosing hypertrophic pyloric stenosis is ultrasonography with direct visualization of the hypertrophied muscle and the pyloric channel.
B Incorrect. The upper gastrointestinal series with delay in gastric emptying and one or two narrow pyloric channels is not the diagnostic method of choice.
C Incorrect. Passing a lighted tube from the mouth into the stomach is not a method of diagnosing hypertrophic pyloric stenosis.
D Incorrect. Doing a pH test on the stomach contents collected over a 48-hour period is a method of diagnosing gastroesophageal reflux.