If they have to do a stomach biopsy, would they do a full upper endoscopy anyway?

Yes: If they are doing an endoscopic stomach biopsy then yes.

Gastroscopy(EGD): Hi, in clinical practice the GI physician usually performs a pan upper GI endoscopy(egd- esophago-gastric dudonescopy) with visualization of the esophagus the stomach and the duodenum upto the second portion of the duodenum, even if the clinical indication for the gastroscopy (egd) is only for a stomach biopsy. Hope this helps.