TY - CHAP M1 - Book, Section TI - Gastrointestinal Bleeding A1 - Lu, Le N. A2 - Tenenbein, Milton A2 - Macias, Charles G. A2 - Sharieff, Ghazala Q. A2 - Yamamoto, Loren G. A2 - Schafermeyer, Robert PY - 2019 T2 - Strange and Schafermeyer's Pediatric Emergency Medicine, 5e AB - Examination of the posterior pharynx in patients with hematemesis may reveal posterior epistaxis 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. SN - PB - McGraw-Hill Education CY - New York, NY Y2 - 2024/04/19 UR - accessemergencymedicine.mhmedical.com/content.aspx?aid=1155427399 ER -