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Clinical Chemistry 42: 1478-1482, 1996;
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Clinical Chemistry, Vol 42, 1478-1482, Copyright © 1996 by American Association for Clinical Chemistry

Using Shewhart p control charts of external quality-assurance program data to monitor analytical performance of a clinical chemistry laboratory

D Chesher and L Burnett
Department of Clinical Chemistry, Institute of Clinical Pathology and Medical Research, Westmead Hospital, NSW, Australia.

We have investigated the application of Shewhart's p control charts in our external quality-assurance program to monitor the long-term performance of our laboratory's analytical quality. The p control charts have been able to detect long-term changes in our laboratory's analytical performance that would have been difficult to detect by more- conventional techniques. We have explored methods for interpreting these charts as well as some of their limitations, which include minimum subgroup size and dependence on constant specification limits. These charts may be not only a simple method for the long-term monitoring of analytical performance of a laboratory, but also of use to the organizers of external quality-assurance programs.


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Copyright © 1996 by the American Association for Clinical Chemistry.