Direct Coomb's test is positive in hemolytic anemia due to:
Paroxysmal cold hemoglobinuria: Caused by the presence of cold-reacting autoantibodies (anti-P Ab) in the blood - Hence, Direct coombs test is positive. Characterized by the sudden presence of hemoglobinuria, typically after exposure to cold temperatures.
Paraxysmal cold hemoglobinuria
Paroxysmal nocturnal hemoglobinuria
Idiopathic thrombocytopenic purpura
Hemolytic uremic syndrome
Hemolytic anemia