Esophageal pH Test

An esophageal pH test measures how often stomach acid enters your esophagus (the muscular tube that carries food and liquids from your mouth to your stomach). It also measures how long the acid stays there. The test involves placing a catheter (a thin tube) or a special device called a pH probe into your esophagus.

The catheter or device will measure your acid level (known as pH level) for 24 to 96 hours. The test can show if you have acid reflux or GERD (gastroesophageal reflux disease): Acid reflux, also called gastroesophageal reflux (GER), happens when stomach acid flows back into the esophagus. You might notice acid reflux after eating a big meal or if you lie down after dinner.

When the acid touches the esophagus, it can cause a burning feeling in your chest or neck. This is known as heartburn. ; GERD is a more serious and long-lasting form of reflux. It causes repeated symptoms and can lead to complications over time. ;  While acid reflux and GERD are not life-threatening, the symptoms can be very uncomfortable and affect your quality of life.

Also, if not treated, GERD can damage the esophagus and lead to more serious health problems.

Why this test is done

You may need this test if you have symptoms of acid reflux. These include:

• Heartburn
• Swallowed food coming back into your mouth (regurgitation)
• Trouble swallowing
• Feeling like there’s a lump in your throat
• Sore throat
• Cough
• Frequent burping

How to prepare

• You should not eat or drink (fast) for four to six hours before the procedure.
• You may be asked to stop taking certain medicines, such as antacids, for 24 hours or for as long as two weeks before your test. Your provider will let you know which medicines to avoid and for how long.
• Tell your provider if you have a pacemaker or an implantable heart defibrillator.
• Tell your provider if you have had problems with your esophagus before or if you have a history of bleeding problems.

Other names for this test

esophageal pH monitoring 24-hour esophageal pH test, esophageal reflux monitoring, esophageal acidity test, pH monitoring, pH probe study, 48-hour Bravo esophageal pH test