24-Hour Esophageal pH Study

A 24-hour esophageal pH study measures how much stomach acid backs up into the food pipe in 24 hours. The most common uses for this gold standard test are:

  • To diagnose gastroesophageal reflux disease (GERD, a feeling of heartburn, pain and food coming back up)
  • For patients with other problems (such as atypical chest pain, recurring pneumonia or throat symptoms)
  • Pre- and post-treatment evaluation to determine if medication dosage is correct
  • For pre- and postsurgical heartburn
  • For non-cardiac chest pain
To prepare for the study:
  • Do not eat or drink anything after midnight. (If you are diabetic, please talk to your primary care doctor.)
  • Do no use gum.
  • Discontinue any acid suppressing medication 5 days before your test unless as instructed by your physician.
  • Ask your physician about taking other scheduled medications.
  • Please make arrangements to bring your PH monitor back 24 hours after the catheter is placed.