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Preparing for your procedure

You have been scheduled by your doctor to undergo either a High Resolution Esophageal Manometry (HRM) and/or a 24hr pH study. This website will help you to understand what the procedure is like and also the costs involved.


Before your appointment: (If you do not follow these instructions, the procedure may be cancelled)

  • The following medications should be stopped before the procedure unless otherwise advised by your doctor
    • Acid medications such as rabeprazole, esomeprazole (nexium), omeprazole, and famotidine, for 1 week
    • Narcotics (tramadol, morphine, codeine etc), benzodiazepines (lorazepam, alprazolam, diazepam) and sleeping medications (zopiclone) for 1 week
    • Motility medicine such as domperidone (motilium), metoclopramide (maxolon) and hyoscine butylbromide (buscopan) for 1 week
    • Blood thinning medications for 3 days (e.g. aspirin, clopidogrel, warfarin)
    • Antacids (gaviscon, MMT etc) for 1 day
  • High blood medications or heart medications can be taken before the procedure with as little water as possible
  • Bathe before arrival as you would not be able to do so for 24 hours once the procedure starts. The machine is not waterproof
  • Do not eat or drink for at least 6 to 8 hours before the procedure
  • Please inform your doctor or the staff if you have any previous nose surgery or injury

Estimated Costs of procedures

Please review the costs and note that the procedures are not Medisave claimable.  If cost is a concern to you, please do not proceed to book the appointment first, and inform your doctor about your concerns. *These costs are only an estimate and are accurate as of 21st October 2016

High Resolution Esophageal Manometry (HRM)

Subsidised: $250+

Private:  $500+

24-hr pH Impedance Monitoring

Subsidised: $500+

Private: $800+

Both procedures

Subsidised: $750+

Private: $1300+

Contact Us

If after watching these videos and evaluating the costs, you do not want to proceed with the appointment, please contact the numbers below to change/cancel your appointment, at least 2 weeks in advance:

Gastro-Intestinal Function Unit at 6326 6013 / 6326 5576

High Resolution Esophageal Manometry (HRM)

  • During this procedure, your nose will be sprayed with a local anaesthetic to numb the nasal area
  • A thin tube will then be carefully placed through your nose and secured to your nose
  • You will lie down and then instructed to swallow some salty water to check your swallowing function
  • This procedure will take roughly 20-30 minutes

24hr pH Study


  • After the HRM has been performed, a thinner tube will be placed again through your nostrils and will be secured to your nose
  • This tube will stay inside you for 24 hours
  • You will be taught how to use the machine to log your symptoms
  • You will have to return the next day to have the tube removed
  • This procedure will take around 15 minutes to complete