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Gastroenterology Diagnostics




Oesophageal Manometry

When you swallow, muscles in your oesophagus contract to help push food towards your stomach. Valves, or sphincters, inside the oesophagus open to let food and liquid through, and then close to prevent food, fluids, and gastric acid from moving backward. The sphincter at the bottom of the oesophagus is called the lower oesophageal sphincter or LES.

The purpose of oesophageal manometry is to see if the oesophagus is contracting and relaxing properly.

The test helps diagnose

  • Cause for swallowing problems
  • Achalasia cardia
  • Non cardiac chest pain
  • Diffuse oesophageal spasm
  • Nutcracker oesophagus
  • Gastroesophageal reflux disease (GERD)

How is oesophageal manometry done?

During oesophageal manometry, a thin, pressure-sensitive tube is passed through your mouth or nose and into your stomach. Once in place, the tube is pulled slowly back into your oesophagus. When the tube is in your oesophagus, you will be asked to swallow. The pressure of the muscle contractions will be measured along several sections of the tube.

Oesophageal pH monitoring

Oesophageal pH monitoring is a test that measures how often and for how long the stomach acid enters the food pipe (oesophagus).

It is a test for diagnosing gastroesophageal reflux disease (GERD) in patients in whom upper GI endoscopy is normal, or in those who have atypical symptoms of GERD (dry cough, throat pain, asthma, hoarseness of voice).

How is the test performed?

A thin tube is passed through your nose or mouth to your stomach. Then it is pulled back into your oesophagus. The tube is attached to a monitor that measures the level of acidity in your oesophagus. You will wear this monitor on a strap and will be asked to keep a diary of your symptoms and activity over the next 24 hours. The next day you will return and the tube will be removed. The information from the monitor will be compared with the diary notes you provide.

Anorectal manometry

It is a test performed to evaluate patients with constipation or fecal incontinence. This test measures the pressures of the anal sphincter muscles, the sensation in the rectum, and the neural reflexes that are needed for normal bowel movements.

How is anorectal manometry done?

The patient lies on his or her left side. A small, flexible tube, about the size of a thermometer, with a balloon at the end is inserted into the rectum. The catheter is connected to a machine that measures the pressure. During the test, the small balloon attached to the catheter may be inflated in the rectum to assess the normal reflex pathways. The nurse or technician may also ask the person to squeeze, relax, and push at various times. The anal sphincter muscle pressures are measured during each of these maneuvers. To squeeze, the patient tightens the sphincter muscles as if trying to prevent anything from coming out. To push or bear down, the patient strains down as if trying to have a bowel movement.

Anal manometry

It measures how strong the sphincter muscles are and whether they relax as they are supposed to while passing a stool. It provides helpful information to the doctor in treating patients with fecal incontinence or severe constipation.


Fecal incontinence

Weak anal sphincter muscles or poor sensation in the rectum can contribute to fecal incontinence. If these abnormalities are present, they can be treated. Bio-feedback techniques using anal manometry and special exercises of the pelvic floor muscles can strengthen the muscles and improve sensation. This can help treat fecal incontinence.


In some patients with constipation, the anal sphincter muscles do not relax appropriately when bearing down or pushing to have a bowel movement. This abnormal muscle function may cause a functional type of obstruction. Muscles that do not relax with bearing down can be retrained with biofeedback techniques using anal manometry.

UPDATED ON 14/05/2024

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