10-cell Information and Courses from MediaLab, Inc.
These are the MediaLab courses that cover 10-cell and links to relevant pages within the course.
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| Understanding the "rule of three" In immunohematology textbooks, the "rule of three" is sometimes presented as follows:1. If a patient plasma or serum gives positive results with a minimum of three antigen-positive cells and negative results with a minimum of three antigen-negative cells, concluding that the serum contains an antibody directed against the antigen has a p value of 0.05.2. Therefore, a p value of 0.05 requires at least three positives and three negatives.The first statement is correct but second statement is a misinterpretation of the p value.Three positives and three negatives are required to identify an antibody with a p value of 0.05 ONLY if you have only a 6-cell panel. It does not mean that you always need three positive cells and three negative cells to get p=0.05.For example: A 10-cell panel with eight Jk(a+) cells and two Jk(a-) cells gives a probability of 0.02 if all the positive cells and none of the negative cells react. A 10-cell panel with eight K- cells and two K+ cells gives a probability of 0.02 if all the positive cells and none of the negative cells react. Learning point: You do not need three positive cells and three negative cells to get an acceptable p value of 0.05. | View Page |