The nurse is assessing the placement of a nasogastric tube in a preterm infant. What assessment finding would confirm correct placement of the nasogastric tube into the stomach?

Choice A rationale A correct nasogastric tube depth measurement in a preterm infant is typically measured from the tip of the nose to the earlobe, and then to a point midway between the xiphoid process and the umbilicus. Inserting the tube to the umbilicus is an excessively deep measurement for a neonate and could place the tube post-pylorically in the duodenum or jejunum, increasing the risk for perforation or malabsorption. Correct placement is vital for safe enteral feeding and to prevent respiratory complications. Choice B rationale Aspiration of gastric contents is a reliable, though not definitive, method of confirming nasogastric tube placement in the stomach. Gastric aspirate in infants is often clear to light-yellow, or sometimes light-green due to bile reflux, and generally has an acidic pH (≤ 5.5). Obtaining a small quantity of this fluid suggests the distal tip of the tube is correctly situated within the stomach, ready for medication administration or feeding. Choice C rationale Auscultating a whooshing or bubbling sound in the epigastric area while simultaneously injecting air (the "air insufflation" method) is an outdated and unreliable technique for confirming nasogastric tube placement in any age group, especially infants. This sound can be generated even if the tube is incorrectly placed in the esophagus or the respiratory tract, providing a false sense of security and potentially leading to dangerous tube misplacement. Choice D rationale Infant crying during the insertion of a nasogastric tube is an expected and common physiological and behavioral response to a mildly invasive procedure that passes through sensitive mucosal areas like the nose and pharynx. Crying does not confirm or negate the final location of the tube tip in the stomach, as it is related to the discomfort of the insertion process itself, not the distal placement.