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Other control checks are performed by the analyst intermittently to quantitate analysis variability in terms of precision and accuracy. These control checks include the use of sample blanks to observe zero concentration drift, introduction of spiked samples to determine percentage of sample recovery during intermediate extraction steps, and processing of sample aliquots to observe within and between run variability for the entire analysis.
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Some control checks may be required as part of the routine analysis or test, and are performed by the analyst to determine the performance of the system. These checks are made on all analyses or tests and intermittently after a specified number of procedures have been completed. Function checks are measurement specific.Ĭontrol checks should be performed during the analytical or testing process. The testing or analytical technician will be provided with written performance specifications for each function check, accompanied by recommended action if the specifications are not met. The Quality Manager will prepare a regular report showing the percent of significantly different check analyses that occurred during that period and recommend corrective action.Ĭontrol charts should be set up and used to record results from selected function and control checks to determine when or if the testing or analytical process is out of control and to record the results of corrective action taken.įunction checks should be performed to verify the stability and validity of the sample and the performance of testing and analytical equipment. Any significant differences will be reported to the Lab Director.
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The data from the check analyses or tests will be compared with that from the analyses or tests and tested for significant differences. The frequency of checks will be determined by ruggedness, precision, accuracy of the method, dependability of the technician, precision and sensitivity of the instrument, difficulty and time length of the test method. quantitate the variability of results from the analysis or test in terms of precisison and accuracy. determine the performance of the analytical or testing systemī. control checks performed during the anlaysis or testing process. function checks performed by the technician to check the validity of the sample and performance of the equipment The following control measures could be implemented in the laboratory: Control measures are necessary to identify sources of measurement error within the laboratory and to estimate their bias and variability (repeatability and reproducibility).