Diagnosis is usually based on history of symptoms. Investigations such as a gastroscopy can be used, especially to make sure no Barrett's oesophagus is present, and to make sure no damage to the oesophagus has occurred.

A 24 hour pH test allows for diagnosis, and also monitoring of patient's response to treatment. It is also possible to diagnose GORD based on a short term treatment with PPIs, with an improvement in symptoms indicating that the patient has the disease.
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