Q:  What is the minimal rate of bleeding needed to have diagnostic value angiography in  GI bleed?


Answer:  0.5 ml/min

 For severe gastrointestinal bleed, which remains undiagnosed by upper or lower GI scope, angiography is a great tool to pinpoint bleeding vessel, but if the minimal rate of bleeding is less than 0.5 mL/minute, it may not provide good diagnostic value angiography in GI bleed.