To confirm NG tube placement in the stomach, the nurse checks gastric fluid pH. Which value indicates gastric contents?

To confirm NG tube placement in the stomach, the nurse checks gastric fluid pH. Which value indicates gastric contents?

• A. 6
• B. 2
• C. 10
• D. 8

Answer: (B)

Gastric contents are highly acidic because of stomach acid. When you aspirate from an NG tube and test the pH, a value around 2 indicates the fluid is gastric. Higher, more alkaline values (like 6, 8, or 10) suggest the fluid is not gastric and could come from the intestines or respiratory tract, or it might be affected by antacid use. So a pH of about 2 is the best sign that the tube is in the stomach. If aspiration is not obtainable or pH is inconclusive, follow your facility’s protocol for imaging confirmation.

Gastric contents are highly acidic because of stomach acid. When you aspirate from an NG tube and test the pH, a value around 2 indicates the fluid is gastric. Higher, more alkaline values (like 6, 8, or 10) suggest the fluid is not gastric and could come from the intestines or respiratory tract, or it might be affected by antacid use. So a pH of about 2 is the best sign that the tube is in the stomach. If aspiration is not obtainable or pH is inconclusive, follow your facility’s protocol for imaging confirmation.