# quiz mx

 .remove_background_ad { border: 1px solid #555555; padding: .75em; margin: .75em; background-color: #e7e7e7; } .rmbg_image { max-height: 80px; } errors that occur in testing process may be either randomsystematic only a cause for rejection of the test run if it exceeds +2SD random error error is not acceptable, as it indicates some failure in the system that can and should be corrected systematic error examples of systematic error shifttrend when the control is on the same side of the mean for five consecutive runs shift when the control is moving in one direction, and appears to be heading toward an out of control value trend can help distinguish between normal variation and systematic error levey-jennings charts in most situations, measurement uncertainty is estimated at 95% coverage for most instances, a range of ___ is accepted as measurement uncertainty that is explained by random variation ± 2SD when QC sample that is used in a test run is out of the acceptable range, the run is considered to be ___________ out of control the closeness of a measurement to its true value accuracy the amount of variation in the measurements precision the difference between the expectation of a test result and an acceptable reference method bias the reliability of a method is judged in terms of accuracy and precision to determine acceptable variation, the laboratory must compute the SD of the ___ values 20 ____ of the values will fall within -1SD and +1SD of the mean 68.3% ____ of the values will fall within -2SD and +2SD of the mean 95.5% ____ of the values will fall within -3SD and +3SD of the mean 99.7% the measurement of variation in a set of results standard deviation (SD) formula : SD when only one control is used, we consider an examination run to be __ if a value is within 2SD of the mean in control the SD expressed as a percentage of the mean coefficient of variation (CV) formula CV CV (%) = SD x 100              ------              Mean used to monitor precision CV ideally, the value of CV should be less than 5% westgard rule was developed by James Westgard multirule system requires running two controls (or 3 controls) of different target values for each set of examinations, developing a Levey-Jennings chart for each, and applying the rules Westgard Rules represent the range graphically for purpose of daily monitoring Levey-Jennings Chart another set of rules used to avoid rejecting runs that may be acceptable Westgard Rule .remove_background_ad { border: 1px solid #555555; padding: .75em; margin: .75em; background-color: #e7e7e7; } .rmbg_image { max-height: 80px; } AuthorAnonymous ID335819 Card Setquiz mx Descriptionmidterms Updated2017-11-08T15:01:37Z Show Answers