oesophagogastroduodenoscopy

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oesophagogastroduodenoscopy (OGD) (ee-sof-ă-goh-gas-troh-dew-ŏ-di-nos-kŏpi) n. endoscopic examination of the upper alimentary tract using a fibreoptic or video instrument. See also gastroscope.
http://hcd2.bupa.co.uk/fact_sheets/html/Gastrointestinal.html Interactive explanations of this procedure from BUPA