If we have to hunt for a sample to use for this that will give consistently comparable results, we aren't testing the method, we are testing our ability to find a suitable sample. I heard that CAP will sell you one that will consistently give the same results. If we aren't going to change anything (can't recalibrate gel!) based on the answers we get (like chemistry would), then why are we doing this? I talked TJC out of it last inspection (I probably got a little heated over the stupidity of it because I had to come in the day after a concussion to meet with them, but maybe they took pity on me and didn't cite me because of my unfiltered brain). No one has been able to explain to me any meaningful takeaway from doing this comparison. If I am ever forced to do it, we will just keep copies of sample results that we run by two methods to solve a problem and make a note that they are acceptable because we expect these differences between methods. If anyone can give me a valid use for this, I would be very appreciative.