IQC
Internal quality control: monitoring the analytical process through control materials, evaluation criteria and decision records.
CV
Coefficient of variation: standard deviation divided by the mean, multiplied by 100. Expresses relative dispersion.
Levey-Jennings
Graph that presents control results in sequence, with mean and standard deviation reference lines.
Westgard Rules
Statistical criteria used to evaluate the behavior of control results. The configuration needs to be defined for the routine.
imprecision
Dispersion of measurement results under specified conditions; must be distinguished from bias.
Bias
Estimation of systematic deviation in relation to a reference value relevant to the procedure.
TEa
Total allowable error: specification chosen to evaluate analytical performance according to purpose and source.
Review and investigation
Documented assessment of an occurrence, considering evidence, hypotheses, actions and conclusion.
Corrective action
Action designed to eliminate the cause of a nonconformity and prevent its recurrence; requires assessment of effectiveness.
CEQ
External quality control: assessment of performance by external comparisons, including proficiency tests.
Records traceability
Possibility to retrieve the origin, context and history of data and documented decisions.
Deepen the concepts in Blog and Scientific Resources.