What is the principle of the Indirect Antiglobulin Test (IAT)?

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Multiple Choice

What is the principle of the Indirect Antiglobulin Test (IAT)?

The main idea behind the Indirect Antiglobulin Test is to detect antibodies present in serum that can bind to red blood cell antigens, but do so in vitro. In this test, red cells with known antigens are incubated with the serum being tested. If antibodies against those antigens are present, they bind to the cells. After washing away unbound antibodies, anti-human globulin is added to see if the bound antibodies cause agglutination. A positive result indicates circulating antibodies in the serum capable of reacting with RBC antigens, which is exactly what the indirect test is designed to reveal. This differs from the direct antiglobulin test, which looks for antibodies already bound to red cells in the patient’s body (in vivo). It also isn’t about detecting antigen expression on the red cell membrane itself, and it isn’t limited to donor serum—any serum containing alloantibodies or autoantibodies can be tested with the IAT.

The main idea behind the Indirect Antiglobulin Test is to detect antibodies present in serum that can bind to red blood cell antigens, but do so in vitro. In this test, red cells with known antigens are incubated with the serum being tested. If antibodies against those antigens are present, they bind to the cells. After washing away unbound antibodies, anti-human globulin is added to see if the bound antibodies cause agglutination. A positive result indicates circulating antibodies in the serum capable of reacting with RBC antigens, which is exactly what the indirect test is designed to reveal.

This differs from the direct antiglobulin test, which looks for antibodies already bound to red cells in the patient’s body (in vivo). It also isn’t about detecting antigen expression on the red cell membrane itself, and it isn’t limited to donor serum—any serum containing alloantibodies or autoantibodies can be tested with the IAT.

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