All of the following are associated with coombs positive hemolytic anemia except -
Coombs is positive only in immune hemolytic anemias where there is hemolysis of RBCs by antibodies produced in the body which is the case in SLE ,PAN & Scleroderma. While in TTP hemolysis occurs due to trauma to RBCs due to Microangiopathic hemolysis, seen in TTP &HUS Ref Robbins 9/e pg 448-449
Thrombotic thrombocytopenia purpura (TTP)
Scleroderma
SLE
PAN
Haematology