Distinguish immediate-spin crossmatch from antibody-based (AHG) crossmatch.

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Multiple Choice

Distinguish immediate-spin crossmatch from antibody-based (AHG) crossmatch.

The key idea is that there are two levels of checking compatibility: a quick immediate-spin crossmatch and a more sensitive antibody-based AHG crossmatch. The immediate-spin crossmatch is a rapid test done at room temperature that mainly verifies ABO compatibility by looking for immediate agglutination between donor red cells and the recipient’s plasma. It works well when there’s no history of antibodies and the antibody screen is negative, so you can quickly proceed with transfusion if no agglutination is seen. If there is a history of alloantibodies or a positive antibody screen, the AHG crossmatch is used. This test includes an antiglobulin reagent that detects antibodies (mostly IgG) bound to donor red cells, revealing clinically significant antibodies that the immediate-spin test might miss. This is why AHG crossmatching is employed when there are known antibodies, prior transfusions, or suspected non-ABO antibodies; it provides a more sensitive assessment to prevent reactions. The statements claiming AHG is always faster, or that immediate-spin detects antibodies beyond ABO, or that the two methods are interchangeable, don’t fit how crossmatching is actually used. Immediate-spin targets ABO compatibility quickly and is limited in antibody detection, while AHG crossmatch is a slower, more sensitive test designed to catch clinically important antibodies.

The key idea is that there are two levels of checking compatibility: a quick immediate-spin crossmatch and a more sensitive antibody-based AHG crossmatch. The immediate-spin crossmatch is a rapid test done at room temperature that mainly verifies ABO compatibility by looking for immediate agglutination between donor red cells and the recipient’s plasma. It works well when there’s no history of antibodies and the antibody screen is negative, so you can quickly proceed with transfusion if no agglutination is seen.

If there is a history of alloantibodies or a positive antibody screen, the AHG crossmatch is used. This test includes an antiglobulin reagent that detects antibodies (mostly IgG) bound to donor red cells, revealing clinically significant antibodies that the immediate-spin test might miss. This is why AHG crossmatching is employed when there are known antibodies, prior transfusions, or suspected non-ABO antibodies; it provides a more sensitive assessment to prevent reactions.

The statements claiming AHG is always faster, or that immediate-spin detects antibodies beyond ABO, or that the two methods are interchangeable, don’t fit how crossmatching is actually used. Immediate-spin targets ABO compatibility quickly and is limited in antibody detection, while AHG crossmatch is a slower, more sensitive test designed to catch clinically important antibodies.

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