A pH reading of 6 or higher on aspirate suggests placement in which location?

• A. Bronchial or small intestine
• B. Gastric
• C. Esophagus
• D. Mouth

Answer: (A)

The key concept is that pH of aspirate helps confirm where a tube is located. The stomach contains strong acid, so gastric aspirate is typically very acidic, usually with a pH around 4 or lower (often even lower). If you measure a pH of 6 or higher, it makes gastric placement unlikely. Non-gastric sites such as the bronchial tree and the small intestine have neutral to mildly alkaline secretions (roughly pH 6–7), so aspirate from those locations will read in the 6–7 range.

Therefore, a pH reading of 6 or higher points to placement in the bronchial passages or the small intestine rather than in the stomach. Keep in mind pH is just one check—medications that raise gastric pH and small-sample variability can affect readings, so imaging or additional verification is often used to confirm placement.