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24-Hour pH Impedance

Your doctor may order a 24-hour pH impedance to evaluate your reflux. This procedure monitors your pH level (level of acidity) for a prolonged period.

24-Hour pH Impedance: Why It’s Performed

Patient set-up for pH monitoring. Patient set-up for pH monitoring.

Our doctors may use this test to measure how often acid leads from your esophagus into your stomach, and if this acid is related to your symptoms. Your esophagus has a muscle at the entrance to the stomach in order to keep food from coming back up into the esophagus. If this valve is not working properly, you may experience heartburn, pain or coughing.

24-Hour pH Impedance: What to Expect

During pH impedance:

  1. Your doctor places a thin, flexible catheter with an acid-sensitive tip through your nose into your esophagus. The catheter is placed in separate recording spots to evaluate the flow of liquid from your stomach into your esophagus.
  2. The catheter stays in your nose for a period of 24 hours.
  3. Your doctor is able to evaluate whether you have gastroesophageal reflux disorder (GERD), the severity of your reflux, and the correlation between your reflux and the symptoms and presence of nonacid reflux. This procedure helps your doctors design a course of treatment.