If the nasogastric tube is in the stomach, the pH of the contents will be acidic. Gastric aspirates have acidic pH values and should be 3.5 or lower. ApH of 7.35 indicates a neutral pH, which may indicate that the tube is no longer in the stomach. Based on this information, the nurse should call the health care provider to request a prescription for a chest radiograph to determine if placement is accurate. Retesting the pH using another strip is unnecessary and checking for placement by auscultating for air injected into the tube is not a definitive method of checking for tube placement. The nurse should not document that the tube is in the correct place because the data indicate this may not be the case.