Wireless pH testing
Wireless pH testing is used to evaluate the acid exposure in your esophagus while patients continue normal activities. During an upper endoscopic procedure, the physician places a small capsule in the lower esophagus. The capsule records activity in that area for over a 48-hour period or 96-hour period and transmits acid levels to a wireless recording device, which is worn on a belt.
Catheter-based pH testing
This pH study is an outpatient, transnasal catheter-based test that measures the amount of acid exposure in the esophagus. Options include with impedance testing and with upper sensors to evaluate for evidence of laryngopharyngeal reflux (LPR). Indications include an uncertainty in diagnosis of GERD, evidence to establish a GERD or LPR diagnosis, or determine adequacy of therapy.
Options for catheter-based pH testing
- 24-hour monitoring of pH alone
- 24-hour monitoring of pH with Impedance Impedance can determine antegrade and retrograde bolus transit in the esophagus. It can be used to detect GERD not responding to PPI and to determine the contribution of acidic, weakly acidic and non-acidic reflux in the setting of symptoms.
- 24-hour monitoring of pH with LPR and Impedance Upper sensors in the proximal esophagus at or just below the upper esophageal sphincter can assess evidence for reflux that may be contributing laryngopharyngeal reflux. This is particularly useful in assessing LPR and other extra-esophageal manifestations of GERD.
pH testing on or off therapy
- Off therapy Testing off therapy is often recommended for patients in whom there is a low index of suspicion for reflux disease and in evaluation for an anti-reflux procedure to document the presence of acid reflux. We recommend avoidance of PPI therapy for at least seven days and H2 blocker therapy for at least two days prior to testing.
- On therapy Testing on therapy is often recommended for patients with refractory reflux symptoms to evaluate adequacy of therapy.