CASE 1: What is the discrepancy? The picture shows ABO forward and reverse typing results in a healthy blood donor, without history of transfusion or transplantation. Which of the following could be the reason for this discrepancy?

CASE 2: A 60-year old man was admitted for colorectal carcinoma, a requisition for 1 unit of PRBC was received by the blood bank for this patient. The blood group mentioned in the requistion form is Blood group A. Picture shows present blood grouping result. What is the possible explanation for this?

CASE 3: Imagine a scenario where ABO antisera are not available and ABO grouping is done using the Anti-H antisera alone. In such a situation, identify the blood group. The red cells of a donor has less reactivity to anti-H antisera than that of O cells but reacts stronger than A1 cells and B cells.

CASE 4: A 40 year old male was brought to the trauma center with active bleeding. He developed hypotension with cold extremities. Massive transfusion protocol was initiated and 2 units of O-Rh negative PRBCs, along with AB plasma was given from the blood bank. Transfusion was initiated but within few minutes of transfusion, he developed acute hemolytic reaction and died later. What is the blood group of the patient?