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This study was conducted to evaluate the blood urea nitrogen/creatinine (BUN/Cr) ratio for distinguishing an upper versus lower source of gastrointestinal (Gl) bleeding. Charts of patients who presented to the emergency department (ED) with the diagnosis of Gl bleeding from August 1995 to August 1996 were retrospectively reviewed for source of bleeding, initial BUN, Cr, BUN/Cr ratio, hematocrit (Hct),...
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