Patient presents with shortness of breath. Blood tests show the patient is anemic. The patient has no obvious blood in the stool. In order to rule out the possibility that the patient is losing blood from his GI tract, what test would you expect to be ordered first? Question 24 options: Upper GI series stool guaiac LFTs liver scan ERCP stool culture Liver biopsy EGD TPN gallbladder ultrasound Lower GI series BE