When would you carry out a incompatibility test?

An incompatibility test is typically carried out prior to blood transfusions, organ transplants, or during pregnancy to ensure compatibility between donor and recipient blood types or tissues. This test helps to prevent adverse reactions, such as hemolytic transfusion reactions, by confirming that the donor's and recipient's blood groups do not have antibodies that would react against each other. It is also crucial in assessing Rh factor compatibility in pregnancy to avoid complications like hemolytic disease of the newborn.