The nurse places a nasogastric tube (NGT) as ordered by the physician.When confirming placement, the nurse aspirates stomach contents and measures the gastric pH at 3. What should the nurse do next?

Choice A rationaleSecuring the tube and retesting the pH in one hour is insufficient to confirm correct placement. While a pH of 3 suggests gastric placement (normal gastric pH is typically 1.5 to 3.5), it doesn't definitively rule out placement in the respiratory tract or intestines, as these can occasionally have acidic pH levels. Delaying definitive confirmation could lead to serious complications if the tube is misplaced.Choice B rationaleInserting the tube an additional 1-2 inches and retesting the pH is not a reliable method for confirming placement. Advancing the tube further without radiographic confirmation could increase the risk of trauma to the gastrointestinal tract or even pulmonary aspiration if the initial placement was incorrect. pH testing alone is not conclusive.Choice C rationaleAuscultating for the "swoosh" of air while injecting air into the NG tube is an outdated and unreliable method for confirming placement. The sound can be misleading and may be heard even if the tube is incorrectly positioned in the esophagus or lungs. This method does not provide definitive proof of gastric placement and poses a risk of aspiration.Choice D rationaleObtaining an x-ray is the gold standard for confirming nasogastric tube placement. Radiographic imaging allows for direct visualization of the tube's trajectory and ensures that the distal tip is correctly positioned in the stomach or duodenum. This method provides the most accurate and reliable confirmation, minimizing the risk of complications such as aspiration or misadministration of feedings and medications.