In antibody screen panel interpretation, what is the Rule of 3?

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Multiple Choice

In antibody screen panel interpretation, what is the Rule of 3?

In antibody screen panel interpretation, you confirm a specific antibody by showing a distinguishable pattern of reactions across multiple panel cells. The Rule of 3 means you should observe at least three panel cells that express the target antigen and react with the patient’s serum, and at least three panel cells that lack that antigen and do not react. This combination provides stronger evidence that the antibody is truly present and specifically targeted, rather than a random or nonspecific reaction. Having three reactive cells helps establish that the antibody is consistently detecting the antigen, while three non-reactive cells help prove specificity by showing those without the antigen don’t react. If you don’t meet these thresholds, the result is not definitive and further testing or a larger panel may be needed. The other options describe procedural elements or different controls that aren’t part of this interpretation rule.

In antibody screen panel interpretation, you confirm a specific antibody by showing a distinguishable pattern of reactions across multiple panel cells. The Rule of 3 means you should observe at least three panel cells that express the target antigen and react with the patient’s serum, and at least three panel cells that lack that antigen and do not react. This combination provides stronger evidence that the antibody is truly present and specifically targeted, rather than a random or nonspecific reaction.

Having three reactive cells helps establish that the antibody is consistently detecting the antigen, while three non-reactive cells help prove specificity by showing those without the antigen don’t react. If you don’t meet these thresholds, the result is not definitive and further testing or a larger panel may be needed. The other options describe procedural elements or different controls that aren’t part of this interpretation rule.

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