upper gastrointestinal (UGI) series

up·per gas·tro·in·tes·tin·al (UGI) ser·ies

(ŭp'ĕr gas'trō-in-tes'ti-năl sēr'ēz)

A fluoroscopic-radiographic examination of the esophagus, stomach, and duodenum; a contrast medium, usually barium sulfate, is introduced in preparation.