what are quality control measures
Quality assessment: The procedure for determining the quality of laboratory measurements using data from internal and external quality control measures. Quality assurance: A definitive plan for laboratory operation that specifies the measures used to produce data of known precision and bias. Quality assurance program: Written policies and procedures that outline how the laboratory intends to produce data of known and accepted quality. Quality control: A set of measures within a sample analysis method to assure that the process is in control. Section 3: QUALITY ASSURANCE. Quality assurance (QA) is a set of operating principles that, if strictly followed during sample collection and analysis, will produce data of known and defensible quality.