 [ Symptoms ] what exams and tests help doctors to evaluate or test people for gastroesophageal reflux disease gerd [ Disease ] the only clear and prescise diagnosis that i am informed of is called an upper gi test where the specialists have you ingest a barium containing drink that emmits some kind of glow inside your body that can be seen through a type of x ray that they view as the barium travels down your gastrointestinal tract actually very interesting to watch