What is the direct antiglobulin test (DAT) and its role in transfusion?

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Multiple Choice

What is the direct antiglobulin test (DAT) and its role in transfusion?

The direct antiglobulin test looks for antibodies or complement bound to a patient’s red blood cells in the body. In transfusion practice, its result shows whether red cells are already coated with immune proteins, which indicates immune-mediated hemolysis and helps guide safe transfusion decisions. A positive result supports diagnoses like autoimmune hemolytic anemia, transfusion reactions caused by antibody-mediated destruction, or fetomaternal alloimmune issues, and it informs subsequent testing and unit selection to prevent further destruction of red cells. It does not detect ABO antigens on red cells—that’s blood typing. It does not detect antibodies in the patient’s serum—that role belongs to the indirect antiglobulin test (antibody screen). It also does not screen for infectious agents in donor blood.

The direct antiglobulin test looks for antibodies or complement bound to a patient’s red blood cells in the body. In transfusion practice, its result shows whether red cells are already coated with immune proteins, which indicates immune-mediated hemolysis and helps guide safe transfusion decisions. A positive result supports diagnoses like autoimmune hemolytic anemia, transfusion reactions caused by antibody-mediated destruction, or fetomaternal alloimmune issues, and it informs subsequent testing and unit selection to prevent further destruction of red cells. It does not detect ABO antigens on red cells—that’s blood typing. It does not detect antibodies in the patient’s serum—that role belongs to the indirect antiglobulin test (antibody screen). It also does not screen for infectious agents in donor blood.

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