title: Raised blood urea concentration indicates considerable blood loss in acute upper gastrointestinal haemorrhage.
mesh_terms: D000208:Acute Disease; D001810:Blood Volume; D006471:Gastrointestinal Hemorrhage / Q000097:blood*; D006801:Humans; D013997:Time Factors; D014508:Urea / Q000097:blood*
chemical_list: D014508:Urea