Final answer:
The correct answer is d. Aspirate gastric contents and measure pH. Aspirating gastric contents and measuring the pH can provide valuable information about the acidity of the stomach.
Step-by-step explanation:
The correct answer is d. Aspirate gastric contents and measure pH.
When a nasogastric (NG) tube is used, it is important to monitor and measure gastric secretions. Aspirating gastric contents and measuring the pH can provide valuable information about the acidity of the stomach. This information is useful in assessing gastric function, diagnosing certain conditions such as hyperchlorhydria or hypoacidity, and determining appropriate treatment.