E.T.
Yes, one of my daughters had upper GIs done at 1 month, 4 months and 7 months. When she was 4 and 7 months old, we had to get to the hospital about 30 minutes before the procedure was scheduled. They took us to a small room where I changed her out of her clothes and into a tiny hospital gown. Then we sat and waited (and played). The room for the procedure was pretty hospital-ish with all sorts of machinery. They had quite a few people in the room with us - a doctor, several techs, a speech pathologist, someone to operate the camera thingy, etc. And there was a control room with another two people. They gave her some white stuff to drink and then had her lay down on an inclined table while they took pictures. Getting her to lie correctly was challenging as she wanted to wiggle. But the techs were nice and helpful and the whole procedure took less than 30 minutes. It was way more difficult for me that for my daughter.
At all three tests, it showed that my daughter had severe reflux (and aspiration of thin liquids at the first two). We didn't really have to do anything as a result of the tests... just continue to keep her on reflux medicine and take the other lifestyle steps (like sleeping on an incline, holding her upright after eating, etc.).
If you need more details, just PM me. Good luck!
Oh - I just read the first response. If your child is dealing with reflux... I can not recommend a chiropractor strongly enough. My daughter was on reflux medicines for four years, and just a few months ago I finally took her to a chiropractor. After six sessions, her reflux is basically gone. I kick myself daily that I didn't take her as an infant, but I didn't think it would help. We're going back for one last upper GI to confirm that her reflux is gone, but she's been off meds for two months and has no more symptoms.