What is a 24-Hour pH / Impedance Test?
Patients with chronic heartburn or other suspicions for gastro-oesophageal reflux disease (GORD) may be asked to undergo a 24-hour pH / Impedance test. This examination quantitatively measures the amount and chemical nature of reflux episodes during a 24-hour period. It can help differentiate between different types of oesophageal reflux episodes (acid vs. non-acid). The test also allows your doctor to correlate your symptom(s) to those episodes of reflux for better symptom management.
Procedure
- A local anaesthetic spray is used to numb the nose and throat.
- A slimline catheter is passed through one nostril, down the oesophagus and into the lower oesophagus / gut. Once in place, the tube is taped to your nose.
- The catheter connects to a small data receiver, which is worn over your shoulder for the duration of the test.
- During the study, you will be asked to keep a diary of when you eat, sleep, and any symptoms that you experience. These symptoms will then be analysed along with the information collected from the receiver.
- You can perform your normal daily activities whilst wearing the monitor, however, you are not able to shower or bathe.
- Please be aware that the catheter will be visible during the test.
- You will be required to return approximately 24 hours after the completion of your procedure, to have the catheter removed or return the data recorder (if removing independently).
Preparation
To ensure a successful test, please follow all instructions carefully. Failure to accurately and completely prepare for your procedure may result in the need to repeat the test.
7 days prior to procedure:
- Several medications alter the pH level of the stomach (by blocking acids) and must be discontinued, unless otherwise instructed; all other usual medications may be continued.
- Losec® (Omeprazole)
- Pariet® (Rabeprazole)
- Somac® (Pantoprazole)
- Nexium® (Esompeprazole)
- Zoton® (Lansoprazole)
- Zantac® (Ranitidine)
- Pepcidine® (Famotidine)
- Tazac® (Nizatidine)
24 hours prior to procedure:
- Stop taking all ‘over-the-counter’ antacids (eg. Gaviscon, Mylanta®, QuickEze, Tums®)
Day of the procedure:
- Please fast for 4 hours prior to your appointment. Sips of water are okay.
- Please advise staff at the time of booking if you are diabetic, as your preparation may be slightly different.