A series of x-rays of the upper digestive (gastrointestinal, or GI) system that are taken after a person drinks a barium solution, which outlines the digestive organs on the x-rays.
UPPER GI SERIES
Meaning of UPPER GI SERIES in English
NCI English Dictionary of Cancer Terms. Английский словарь раковых терминов NCI(Национальный институт злокачественных новообразований). 2012