Table 20. Sentinel tests.

Recommended practice	Definition of “sentinel tests” (based on robustness, analyser configuration, etc.) using the manufacturer’s instructions (most reliable source of information on this subject). Definition of a strategy for conducting IQC or patient samples for these “sentinel tests”. Monitoring of these performance indicators.
Acceptable practice	Implemented but lack of monitoring of the indicator.
Unacceptable practice	Error in the choice of “sentinel tests” (which are not the most sensitive).
IQC – internal quality control.