Which antibody is enhanced by the addition of 0.2N HCl, which decreases pH to 6.5?

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Multiple Choice

Which antibody is enhanced by the addition of 0.2N HCl, which decreases pH to 6.5?

The key idea is that some antibodies bind better when the environment is acidic. Lowering the pH to about 6.5 with a small amount of HCl can enhance the interaction between certain antibodies and their red cell antigens. For anti-M, this acidified environment makes the antibody bind more readily to the M antigen on red cells, increasing agglutination and making it easier to detect. In practice, the acidified serum technique uses 0.2N HCl to push the pH to around 6.5, which strengthens anti-M reactivity that might be weak at neutral pH. The other antibodies listed—anti-D, anti-K, and anti-Fya—do not typically show increased reactivity under these acidic conditions; they are detected under standard testing conditions or with other enhancements, not by acidification.

The key idea is that some antibodies bind better when the environment is acidic. Lowering the pH to about 6.5 with a small amount of HCl can enhance the interaction between certain antibodies and their red cell antigens. For anti-M, this acidified environment makes the antibody bind more readily to the M antigen on red cells, increasing agglutination and making it easier to detect.

In practice, the acidified serum technique uses 0.2N HCl to push the pH to around 6.5, which strengthens anti-M reactivity that might be weak at neutral pH. The other antibodies listed—anti-D, anti-K, and anti-Fya—do not typically show increased reactivity under these acidic conditions; they are detected under standard testing conditions or with other enhancements, not by acidification.

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