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Clinical Chemistry and Laboratory Medicine (CCLM)

Published in Association with the European Federation of Clinical Chemistry and Laboratory Medicine (EFLM)

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Westgard multirule for calculated laboratory tests

Abdurrahman Coskun1


Corresponding author: Abdurrahman Coskun, MD, Duzce University, School of Medicine, Department of Clinical Biochemistry, Konuralp-Duzce, Turkey Phone: +90-542-2380639, Fax: +90-380-5414105

Citation Information: Clinical Chemical Laboratory Medicine. Volume 44, Issue 10, Pages 1183–1187, ISSN (Online) 1437-4331, ISSN (Print) 1434-6621, DOI: 10.1515/CCLM.2006.233, October 2006

Publication History

May 16, 2006
July 10, 2006


Background: In clinical laboratories, many test results such as low-density lipoprotein (LDL)-cholesterol can be calculated using the results of specifically measured tests. However, quality control programs deal only with measured tests and there is no adequate quality assessment procedure for calculated tests. I aimed to apply the Westgard multirule to calculated tests as a part of routine quality procedures.

Methods: I prepared a Levey-Jennings chart for calculated tests and all their measured components (Equation chart) and then applied the Westgard multirule to these tests.

Results: Applying the Westgard multirule to calculated LDL-cholesterol (and other calculated tests) was simple, and increased the reliability of the results of the calculated tests.

Conclusions: Checking the reliability of only measured tests by quality control procedures before reporting patient results may be inadequate. Applying the Westgard multirule to calculated tests as part of total quality management will increase the reliability of test results.

Clin Chem Lab Med 2006;44:1183–7.

Keywords: laboratory management; quality control; reliability; Westgard multirule

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