What is the purpose of the 37C phase?

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Multiple Choice

What is the purpose of the 37C phase?

The 37°C phase is the incubation step that allows IgG antibodies in plasma to bind to red cell antigens. IgG is the class that most often causes clinically significant alloantibodies, and these antibodies do not typically produce visible agglutination during the immediate spin. By incubating at 37°C, IgG antibodies have the opportunity to attach to donor red cells; after washing, the antiglobulin (Coombs) reagent detects those bound IgG molecules, revealing a positive reaction. IgM antibodies, in contrast, usually react at room temperature or colder and are detected during the immediate spin or cold-phase testing, not the 37°C phase. Detecting complement is not the primary goal of this phase; complement detection is a separate consideration and is not the function of the 37°C incubation itself.

The 37°C phase is the incubation step that allows IgG antibodies in plasma to bind to red cell antigens. IgG is the class that most often causes clinically significant alloantibodies, and these antibodies do not typically produce visible agglutination during the immediate spin. By incubating at 37°C, IgG antibodies have the opportunity to attach to donor red cells; after washing, the antiglobulin (Coombs) reagent detects those bound IgG molecules, revealing a positive reaction. IgM antibodies, in contrast, usually react at room temperature or colder and are detected during the immediate spin or cold-phase testing, not the 37°C phase. Detecting complement is not the primary goal of this phase; complement detection is a separate consideration and is not the function of the 37°C incubation itself.

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