Electrogastrogram (EGG) Tests

This test is a non-invasive way to measure gastric function, where electrodes placed on the skin of the abdomen record the electrical activity of the stomach.

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What is an Electrogastrogram test?

EGG is a non-invasive way to measure gastric function, where electrodes placed on the skin of the abdomen record the electrical activity of the stomach.

The procedure takes about 45 minutes and requires no special preparation or any anaesthesia.

EGG can be used to help diagnose disorders of stomach function like gastroparesis where the stomach empties into the small intestine too slowly, which can also contribute to reflux.

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How it works

The 60–90-minute procedure requires no special preparation or anaesthesia. Electrodes may be placed on shaved skin and left for 10–15 minutes for calibration. A baseline trace of your stomach's electrical signals will then be recorded for comparison.

A water load satiety test is performed, this involves drinking up to one litre of water in 5 minutes until you feel full.

Several additional traces of your stomach's electrical signals are recorded over 30 minutes before the electrodes are removed. The traces are analysed, and a report is sent to your referring doctor.

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Preparing for your test

Before you test, there are some things we ask you to do, to ensure safety and accurate results. This includes stopping certain medication and fasting for a short period.

Please read our patient information leaflet for full details.

For 3 days before your test

Do not take promotility agents (e.g. metoclopramide, domperidone etc) or opiates (e.g. codeine, tramadol, morphine etc).

Midnight before the test

Nothing should be eaten after midnight the day before the test.

The day of your test

You cannot eat or drink anything after midnight on the day before the test.

You may take your usual medications with a small amount of water (up to 1/3 of a glass or 100ml) up to two hours prior to the study, but should not drink any coffee, tea, or fruit juice.