Do I have to get some blood tests before doing an endoscopy?

Okay to get EGD. Most endoscopists would say "no", unless the egd (esophagogastroduodenoscopy = upper endoscopy) was ordered in response to a lab abnormality that has to be trended (like a dropping blood count), or if endoscopic intervention is anticipated and you have a clotting problem (to check coagulation). Your primary care doctor who orders the egd can determine if preliminary testing is first needed.