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24 Hour pH Test

What is a 24-hour pH study?It is a test to measure the amount of acid reflux that occurs over 24 hour period. Acid reflux is a condition when the acidic content of the stomach comes up into the food pipe or oesophagus. It is also known as oesophageal pH testing or 24-hour pH impedance testing.

When is it advised?This test is commonly used in diagnosing GERD or to determine the cause of various symptoms, including heartburn, hoarseness or voice changes, difficulty swallowing, a sensation of a lump in the throat, persistent cough or throat clearing. The procedure may also be performed to assess the effectiveness of ongoing treatment for reflux.

How to prepare for the test?
  • Do not eat or drink for four to six hours before the oesophageal pH testing. You can eat normally after the catheter is placed.
  • You should not take any antacids 24 hours before the test.
  • You must inform the doctor if you are pregnant, have allergies, are on insulin or have a heart or lung condition or any other disease.
  • There is no need for anaesthesia or sedation.
  • A gel will be applied to the nose and throat to make you comfortable during the procedure.
How is it performed?A catheter or fine tube is placed through the nose into the opening of the stomach. The following steps are performed during the procedure:
  • It starts by measuring the distance between your nose to the stomach’s opening with the help of a manometry catheter.
  • The doctor will put the testing catheter’s end into your nose, and you will be asked to swallow sips of water. The doctor will then gently push the catheter into the opening of your stomach.
  • Once the catheter is placed, the other end is secured to your face with the help of tape and wrapped over your ear.
  • There is a small smartphone-like monitor which you will wear on a belt. It is a small data recorder that picks up information from the catheter inside your body.
  • After the catheter is inserted, you can go back to your normal eating and drinking pattern. The tube will not cause any hindrance in breathing, eating, drinking and talking. You can leave the centre after the procedure.
  • The procedure takes 10 to 20 minutes. You will be advised to return to the Bangalore Gastro Centre after 24 hours. The doctor then analyses the data of your test record and observes the change in acid levels throughout the 24 hours.
What are the risks associated with the test?The 24-hour pH testing is easy and safe for most people. However, some people may develop symptoms like mild irritation in the throat and gag reflex. There is no other risk associated with this test.

What happens after the test?
  • As it involves no sedative or anaesthesia, you can go home directly without any help.
  • You will be advised to return to Bangalore Gastro Centre after 24 hours.
  • The doctor then analyses the data of your test records and observes the change in acid levels throughout the 24 hours.
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