Techniques
PH Capsule: This is a new type of pH probe which requires no tube though the nose. It is a sensor that is attached to the lining of the esophagus, with an endoscope.
Often this procedure is carried out at the same time as having an endoscopy (upper GI) performed. The pH sensor sends signals to a portable computer which collects the data about the acid exposure over the usual 24 hrs. There is no removal procedure, the sensor will slowly detach itself from the esophagus with time and is then passed though a normal stool
Impedance Study: Similar to a standard pH test, but with two probes. One sits in the stomach and the other just above the stomach. The advantage of the dual sensor is that it can detect both acid and alkaline reflux travels. The tube is inserted through the nostril (this can be placed whilst still sedated after an endoscopy), and the other end is attached to a small computer, no bigger than a Walkman
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