The nurse inserts a gastric feeding tube into the patient. Which method used by the nurse is most accurate to verify placement of the patient's feeding tube?
a. Gets a pH of 4.0 from the feeding tube aspirate
b. Obtains a pH of 7.0 from the gastric aspi-rate
c. Listens at the tube distal to the pyloric sphincter
d. Locates the tube above the cardiac sphincter
A
The nurse inserts a gastric feeding tube and expects to confirm tube placement in the stomach; the nurse verifies gastric placement by measuring the pH of the aspirate and expects it to be 4.0 or less because hydrochloric acid from gastric parietal cells acidify gastric contents. Feeding tube aspirate of 7.0 is most likely from the intestines. A gastric feeding tube is above the pyloric sphincter, the sphincter that controls gastric emptying into the duodenum. The cardiac sphincter is above the area where a pH sample could be obtained.
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