RT Book, Section A1 Maloney, Patrick J. A1 Bakes, Katherine M. A2 Schafermeyer, Robert A2 Tenenbein, Milton A2 Macias, Charles G. A2 Sharieff, Ghazala Q. A2 Yamamoto, Loren G. SR Print(0) ID 1105683762 T1 Gastrointestinal Bleeding T2 Strange and Schafermeyer's Pediatric Emergency Medicine, 4e YR 2014 FD 2014 PB McGraw-Hill Education PP New York, NY SN 978-0-07-182926-7 LK accessemergencymedicine.mhmedical.com/content.aspx?aid=1105683762 RD 2024/03/29 AB Examination of the posterior pharynx in patients with hematemesis may reveal a posterior nosebleed as the cause.The Apt–Downey test can differentiate swallowed maternal blood from neonatal GI bleeding.Vascular malformations are a rare but serious cause of both upper and lower GI bleeding.Melena typically indicates proximal bleeding, while hematochezia is usually seen with bleeding from the distal colon and rectum.