Tuesday, July 30, 2019

BUN;Cr ratio in GI bleed

Q: Patients with acute lower Gastro-intestinal (GI) bleeding with normal kidney function tends to have a normal blood urea nitrogen and creatinine (BUN:Cr) ratio? (select one)

A) True
B) False

Answer: A

Looking at BUN:Cr ratio is an excellent and quick method to differentiate between acute upper and lower GI bleed. Patients with acute lower GI bleeding and normal kidney function is very unlikely to have BUN:Cr ratio > 20:1.



Mortensen PB, Nøhr M, Møller-Petersen JF, Balslev I. The diagnostic value of serum urea/creatinine ratio in distinguishing between upper and lower gastrointestinal bleeding. A prospective study. Dan Med Bull 1994; 41:237.

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