What is 72-Hour pH Testing?
72-hour pH testing is the gold standard investigation for gastro-oesophageal reflux disease (GORD). It measures the amount of acid exposure in the oesophagus over an extended period, correlating symptoms with acid episodes.
We use the Bravo™ wireless pH monitoring system — a small pH-sensing capsule that is attached to the oesophageal wall during gastroscopy and wirelessly transmits data to a small receiver worn on your belt or wrist. The capsule naturally detaches and passes through the digestive tract after 5–7 days.
Who Needs pH Testing?
- Persistent heartburn or reflux symptoms not adequately controlled with medication
- Atypical reflux symptoms (chronic cough, hoarseness, chest pain)
- Pre-operative assessment for anti-reflux surgery
- Assessment of treatment efficacy (on vs. off acid-suppression therapy)
- Suspected non-acid reflux
- Evaluation of unexplained oesophageal symptoms
How the Test Works
Capsule Placement
During a brief gastroscopy procedure, the Bravo™ capsule is attached to the oesophageal wall. Sedation is used for comfort.
72-Hour Recording
Over the next 72 hours, the capsule continuously measures and wirelessly transmits pH data to a small portable receiver.
Symptom Diary
You press buttons on the receiver to log symptoms (e.g. heartburn, meals, lying down) in real time for correlation with pH data.
Data Analysis
After 72 hours, you return the receiver. Your specialist analyses the data and correlates acid exposure with your symptoms.
During the Test Period
- Resume normal diet and activities — the test is designed to reflect your real-life acid exposure
- Log all meals, symptoms, and time lying down using the receiver buttons
- You may shower normally; avoid submerging the receiver
- Some patients experience mild chest discomfort from the capsule for the first 24–48 hours
- Avoid MRI scans while the capsule is in place