1. Detecting errors in blood-gas measurement by analysis with two instruments;Metzger;Clin. Chem.,1987
2. Performance validation of blood gas instruments using three levels of control for pH, PCO2 and Po2 - procedure and assessment by interactive computer simulation;Westgard,1980
3. Validation of iQM active process control technology;Westgard;Point of Care,2003
4. Validation of a quality assessment system for blood gas and electrolyte testing;Toffaletti;Clin. Chim. Acta,2007
5. IL GEM 3000 IQM does not detect clinically important shift in ionized calcium. Is it premature to suspend regular QC practices in the IL GEM series?;Lau;Clin. Chem.,2007