We continue our series on basic QC interpretation. Part 1 was easy - just 1 control. Now what happens when we have 2 controls? How do we interpret across materials/levels? Does that mean we stop interpreting across runs? Here's another simple exercise - if you're told that all the rules have been broken, can you find where the violations occurred?
Basic QC Practices
Answers to the Part One (N=1) of Break All The Rules.
We spend most of our time trying to keep all of our data within the limits, obeying the rules, maintaining compliance. But if we needed to, could we recognize when the rules were really broken? Here's a simple exercise - if you're told that all the rules have been broken, can you find where the violations occurred?
Here's a laboratory quality control mystery. See if you can guess what happened with the following real-world QC situation...
A reader-submitted example reminds us how common the use (and mis-use) of manufacturer ranges and package inserts can blind laboratories to the true problems occurring in their methods.