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What is a characteristic feature of a 2+ blood reaction grade?

Clear supernatant with many medium-sized clumps

A 2+ blood reaction grade is characterized by a clear supernatant that contains many medium-sized clumps. This grading is typically used in blood typing and compatibility testing to indicate the presence of antibodies that are reacting with specific antigens on the red blood cells.

In this context, the clear supernatant indicates that the majority of the cells have agglutinated and are no longer suspended in the fluid, while the medium-sized clumps reflect a moderate level of agglutination. A clear supernatant suggests that there are no major sediments or additional reactions occurring, which is expected in a 2+ result where the reaction is distinguishable but not extremely robust.

Other options describe variations that do not align with the characteristics of a 2+ reaction. For example, a cloudy red supernatant with numerous small clumps would suggest a less defined reaction, possibly indicating weaker agglutination or a 1+ reaction. Clear supernatant with several large clumps or no free cells with one solid clump might indicate stronger agglutination than what is classified as a 2+ reaction, more typically seen in higher grades such as 3+ or 4+. Understanding these nuances helps ensure accurate interpretation of test

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Cloudy red supernatant with numerous small clumps

Clear supernatant with several large clumps

No free cells with one solid clump

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