Indirect antiglobulin test (IAT) detects sensitization that occurred in which location?

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Multiple Choice

Indirect antiglobulin test (IAT) detects sensitization that occurred in which location?

The key idea is that the indirect antiglobulin test detects antibodies that have the potential to bind red cell antigens in a test tube, not inside the patient. In the IAT, patient serum is mixed with reagent red cells and incubated; if antibodies against the red cell antigens are present, they bind to those antigens during this in vitro incubation. After washing away unbound antibodies and adding antiglobulin, any bound antibodies cause agglutination, revealing sensitization that occurred in the lab. This contrasts with the direct antiglobulin test, which detects antibodies that are already bound to red cells within the patient (in vivo). So the best description is that sensitization detected by IAT occurs in vitro. The other options don’t fit: in vivo refers to DAT, and “on RBC membranes only” or “during transfusion” aren’t the specific testing context for IAT.

The key idea is that the indirect antiglobulin test detects antibodies that have the potential to bind red cell antigens in a test tube, not inside the patient. In the IAT, patient serum is mixed with reagent red cells and incubated; if antibodies against the red cell antigens are present, they bind to those antigens during this in vitro incubation. After washing away unbound antibodies and adding antiglobulin, any bound antibodies cause agglutination, revealing sensitization that occurred in the lab. This contrasts with the direct antiglobulin test, which detects antibodies that are already bound to red cells within the patient (in vivo). So the best description is that sensitization detected by IAT occurs in vitro. The other options don’t fit: in vivo refers to DAT, and “on RBC membranes only” or “during transfusion” aren’t the specific testing context for IAT.

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