<prompt> Minimum amount of GI bleed to cause malena is10 ml40 ml60 ml115 ml  <response>: Melaena refers to the passage of typical black, tarry coloured foul smelling stool. It signifies upper GI bleed. At least 50-60 ml bleeding should be there to cause melaena. Reference : page 834 SRBs manual of surgery 5th edition 