The nurse has inserted a nasogastric (NG) tube in a client and is checking for the correct placement of a NG tube. Which is the most reliable data to ensure that the end of the tube is in the stomach?...

The nurse has inserted a nasogastric (NG) tube in a client and is checking for the correct placement of a NG tube. Which is the most reliable data to ensure that the end of the tube is in the stomach?

 1. Placement is verified on x-ray. 2. The pH of the aspirated fluid is 5. 3. The aspirated fluid is bile green in color. 4. Air injection is auscultated in the left upper quadrant.