What pH value indicates correct nasogastric tube placement when aspirating gastric contents?

What pH value indicates correct nasogastric tube placement when aspirating gastric contents?

• A. 5.5 or below
• B. 7.0
• C. 6.5
• D. 8.0

Answer: (A)

Gastric contents are acidic, so checking the pH of aspirated material from an NG tube helps confirm it’s in the stomach. A pH of 5.5 or below is the threshold that indicates gastric placement at the bedside. This quick test works well in many patients because stomach acid keeps the aspirate acidic. If the pH is higher than 5.5, the tube may be in the esophagus or intestines, or acidity may be blunted by antacids or certain feeds, so radiographic confirmation is needed before using the tube. Therefore, a value of 5.5 or below best indicates correct gastric placement.

Gastric contents are acidic, so checking the pH of aspirated material from an NG tube helps confirm it’s in the stomach. A pH of 5.5 or below is the threshold that indicates gastric placement at the bedside. This quick test works well in many patients because stomach acid keeps the aspirate acidic. If the pH is higher than 5.5, the tube may be in the esophagus or intestines, or acidity may be blunted by antacids or certain feeds, so radiographic confirmation is needed before using the tube. Therefore, a value of 5.5 or below best indicates correct gastric placement.