johermajan

I agree that it doesn't seem cost effective to buy a commercial control when you're getting low volumes of body fluid request. But I don't understand how the correlation of the automated or hemocytometer cell count with a cytospin slide works, considering that a cytospin is a concentrated preparation of the body fluid being tested.

We run body fluids except CSF on LH750. We do background check first and then run sample in duplicate but we never use any external control for QC. We got dinged during our last CAP inspection for not using any control material or not having any procedural control. He cited that running the test in duplicate has nothing to do with QC requirement. What does your laboratory do? Do you use external controls?