Minimum amount of GI bleed to cause malena is
10 ml
40 ml
60 ml
115 ml
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 SRB's manual of surgery 5th edition
Urology