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Talking with your doctor about your symptoms may be enough for him or her to make a diagnosis of gastroesophageal reflux (GERD). However, additional tests may be recommended to determine its severity, including:

  • Upper GI Endoscopy: An endoscope is a device consisting of a flexible tube and a mini camera. In endoscopy, this device is introduced through the mouth to view the esophagus, stomach and upper small intestines.
  • Upper GI Series: These are a series of X-rays that examine the esophagus, stomach and small intestine. The X-rays are taken after you have swallowed a barium suspension, which coats the lining of the upper gastrointestinal tract. A radiologist then looks for irregularities in the linings, which can help diagnose a variety of digestive problems.
  • Esophageal Manometry: This test measures the motor action of the lower esophageal sphincter and esophageal body. A catheter measures esophageal pressure and records the duration and sequence of contractions.
  • Esophageal pH Monitoring: This is a test to measure the frequency and duration of stomach acid that enters the esophagus.

Reviewed by health care specialists at UCSF Medical Center.

Related Information

UCSF Clinics & Centers


Gastroenterology at Mount Zion
1701 Divisadero St., Suite 120
San Francisco, CA 94115
Phone: (415) 502-4444
Fax: (415) 502-2249
Appointment information

Gastroenterology at Parnassus
350 Parnassus Ave., Suite 410
San Francisco, CA 94143
Phone: (415) 502-2112
Fax: (415) 514-3300
Appointment information

Gastrointestinal Motility & Secretion Center
400 Parnassus Ave., Box 0310
San Francisco, CA 94143-0310
Phone: (415) 353-9383
Fax: (415) 353-2505
Appointment information