Levey-Jennings chart


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qual·i·ty con·trol chart

a chart illustrating the allowable limits of error in laboratory test performance, the limits being a defined deviation from the mean of a control serum, most commonly ± 2 SD.
See also: quality control.
Synonym(s): Levey-Jennings chart
Farlex Partner Medical Dictionary © Farlex 2012

qual·i·ty con·trol chart

(kwahl'i-tē' kŏn-trōl' chahrt)
A chart illustrating the allowable limits of error in laboratory test performance, the limits being a defined deviation from the mean of a control serum, most commonly ±2 standard deviations.
Synonym(s): Levey-Jennings chart.
Medical Dictionary for the Health Professions and Nursing © Farlex 2012

Levey-Jennings chart

(lev′ē-jen′ingz)
[S. Levey, 20th-cent. U.S. statistician; E.N. Jennings, 20th-cent. U.S. statistician]
A graphical representation of control data, arranged in chronological order, that shows a mean or target value and one or more sets of acceptable limits.
Medical Dictionary, © 2009 Farlex and Partners
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References in periodicals archive ?
Also known as a Levey-Jennings chart, this is prepared by conducting a number of per-protocol runs of the assay (normally, to provide a minimum of 20 replicate measurements for each control material, over a period of at least 10 days, and ideally with different operators).
Applications of control charts in the molecular lab
This SD plus the new mean can be used with confidence in setting up the Levey-Jennings chart for the new lot of control.
Three Knotty QC problems untied
The Levey-Jennings chart remains a staple of laboratory QC.
Continuous Improvement in Continuous Quality Control
The primary tracking method was the Levey-Jennings chart for graphing the analytical results.
Quality systems for unit-use testing devices
The control system includes the control materials, the mean and standard deviation used to set the Levey-Jennings chart, and the process control rules applied.
Resolving QC failures
The probability of the multirule procedure for error detection is much improved over the use of the Levey-Jennings chart having a [+ or -]3 SD limit for determining acceptability of QC data.
Answering your questions; quality-control criteria
The quantitative control results would also be plotted on a Levey-Jennings chart and observed for shifts, trends, and outliers.
Finding control in quality control of unit-use prothrombin time tests
Regardless of how the control limits are established, a Levey-Jennings chart still operates as a statistical control.
Establishing and evaluating QC acceptability criteria
For example, the computer might be told that the desired sequence is to enter quality control data; view the computer-calculated mean, standard deviation, and coefficient of variation; save those statistics; produce a Levey-Jennings chart; go back to the chart if you want to change values on it; and repeat the procedure for the next batch of QC data.
Quicker QC on a small microcomputer
Levey-Jennings charts for 2 QCsamples (QC1/QC2) for 6 signature peptides (AKPAL, apo A-I; FPEVD, apo B; TPDVS, apo C-I; ESLSS, apo C-II; GWVTD, apo C-III; and LGPLV, apo E).
Robust and Accurate 2-Year Performance of a Quantitative Mass Spectrometry-Based Apolipoprotein Test in a Clinical Chemistry Laboratory
Mention is made of Levey-Jennings charts and Westgard Rules but there is really no mention of how to use these tools in the context of day-to-day blood gas laboratory operation.
Clinical blood gases: Assessment & Intervention, 2nd edition
GloCyte uses disposable test cartridges, ensuring no sample carryover and easy disposal, and it includes built-in quality control using Levey-Jennings charts and an audit table.
Supporting the clinical lab in chemistry, microbiology, and hematology

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