Table 16. Targeting IQC values.

Recommended practice	Regular analysis of control charts practice (weekly). In the case of compensation, the laboratory documents the retargeting or comparison of results with a peer group or with the EQA(s).
Acceptable practice	Shift in the mean (more than one standard deviation) that may result in false rejection without retargeting. Shift that can lead to false acceptance but without any clinical impact. Control cards with floating average and rigorous monitoring of any discrepancy (activation of the corresponding rules (e.g. 10x, etc.).
Unacceptable practice	Re-screening without investigation or argument (except in the case of floating average control charts).
IQC – internal quality control. EQA – external quality assessment.