HESI Fundamentals Exam Related

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A client requires gastric decompression, and a nurse is inserting an NG tube. Which action should the nurse take to verify proper placement of the tube?

  • A. Assess the client for a gag reflex
  • B. Measure the pH of the gastric aspirate
  • C. Place the end of the NG tube in water to observe for bubbling
  • D. Auscultate 2.5 cm (1 in) above the umbilicus while injecting 15 mL of sterile water
Correct Answer: B

Rationale: Measuring the pH of the gastric aspirate is the most reliable method to confirm proper placement of an NG tube. Gastric fluid has an acidic pH, typically ranging from 1 to 5. Assessing the client for a gag reflex (choice A) is important for airway protection but does not confirm tube placement. Placing the NG tube in water to observe for bubbling (choice C) is incorrect and not a reliable method for verifying placement. Auscultating 2.5 cm above the umbilicus while injecting sterile water (choice D) is an outdated method and is not recommended for verifying NG tube placement.