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An impedance and pH study measures the amount of acid and nonacid gastroesophageal reflux your child has. Gastroesophageal reflux is the backward flow or reflux of food and acid from the stomach into the esophagus. The esophagus is the tube that takes food from your mouth into your stomach. Everyone has some reflux. An impedance and pH study will help identify if your child has increased amounts of reflux and if it is causing trouble breathing or other symptoms.
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