Re: What is an EDG test?
I think you mean EGD. It's EsophagoGastroDuodenoscopy ("looking at the esophagus, stomach and duodenum"); mostly people just call it an endoscopy ("looking inside").
It's not really a "test", just a "scope" - an internal observation. Usually you will have biopsies taken and they will be tested, but otherwise the EGD itself is just a way to look at how your insides are doing.