The best replacement for upper gi is lower gi.

The best alternatives to upper gi are rated as following:
★★★★★  lower gi
★★★★  endoscopy
★★★★  egd
★★★  barium swallow
★★  swallow study
★  upper endoscopy
  esophagram
  upper gi endoscopy
  swallow

Your alternative for upper gi is not listed? Suggest!
Speaking about upper gi, one probably shouldn't forget about small bowel series.

Other search terms related to upper gi and their ratings are:
★★★★★ small bowel series
★★★ barium swallow
★★★ esophagram
You have in mind a companion for upper gi and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of upper gi in all years. Click on graph for more.
upper gi
lower gi
endoscopy