Usually, this is done in conjunction with what's called the Westgard Rules
, which are a convention that an instrument run and all its results should be scrutinized if any one control exceeds 2s from the mean (known as a 1(2s) violation).
On applying Westgard rules
on the internal quality control data of protein all runs were acceptable at both control levels.
11 built-in quality control program - the possibility of graphical representations of control, the possibility of Westgard rules
Sophisticated user-definable display of QC results should include Levey-Jennings plots and interactive display of violations of user-selected rules, such as Westgard rules
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.
Quality control using Westgard rules
of graphical presentation and statistical evaluation of audit results.
and Levey-Jennings charts are the statistical tools typically used by clinical labs.
And learn to treat the Westgard rules
like the castle moat.
An L-J chart and the Westgard Rules
are frequently used to verify trends, biases, or errors in quality controls.
A standard guide for the application of Westgard Rules
, for example, has been updated to reflect quality controls for genetic testing (Basic QC Practices, 3rd ed.
Few people recognize that the multirule QC procedure known as Westgard Rules
(3) was the outcome of a similar simulation study (4).
When used routinely with traditional tools such as Levey-Jennings charts and Westgard Rules
, the laboratory is alerted to test system errors so corrective action can be performed before system failures occur.