# 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.

## 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.

## 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.
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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).
The Levey-Jennings chart remains a staple of laboratory QC.
This SD plus the new mean can be used with confidence in setting up the Levey-Jennings chart for the new lot of control.
The primary tracking method was the Levey-Jennings chart for graphing the analytical results.
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.
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.
Regardless of how the control limits are established, a Levey-Jennings chart still operates as a statistical control.
Through this repetition of calculated numbers, the framework of the Levey-Jennings chart is drawn--the continuous horizontal lines that represent the mean and the mean 2 SD.
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.
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.
AUDIT provides AUDITOR QC, a free online data reduction program that offers Levey-Jennings charts and peer group analysis for daily quality control product users, as well as linearity graphs and peer group analysis.
Westgard rules and Levey-Jennings charts are the statistical tools typically used by clinical labs.

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