The nice people at Westgard QC sent
their update today. You can read it by clicking
here. As always it was rather dry, but QC stuff usually is.
Here’s a question… It’s pretty much accepted
that you’d expect that one in twenty QC results (of a given assay) will
be outside 2sd limits if you are measuring something as a numerical result. What
about if you are doing a positive/negative test? At what level is the
difference between positive and negative? Would you still expect one in twenty
to be out?
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