Direct coomb's test positive is seen in all except?: (A) ABO incompatibility, (B) Hemolytic d/s of newborn, (C) Aplastic anemia, (D) Autoimmune hemolysis
Answer is C. Ans. (c) Aplastic anemia(Ref: Wintrobe 13th ed/Page 576)Coomb's test is positive in Immune hemolytic anemiaThey can be of 2 types:#Direct Coomb's test- Detects Antibody on RBC SurfaceQ#Indirect Coomb's test- Detects Antibody in SerumOut of the given options: Aplastic anemia is not a hemolytic anemia and so is automatically the answer here.