Clinical Chemistry AACC Online Job Center
HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
QUICK SEARCH:   [advanced]


     

Clinical Chemistry 23: 1881-1887, 1977;
This Article
Right arrow Full Text (PDF)
Right arrow Submit an electronic Letter to
the Editor about this paper
Right arrow Alert me when this article is cited
Right arrow Alert me when eLetters are posted
Right arrow Alert me if a correction is posted
Right arrow Citation Map
Services
Right arrow Email this article to a friend
Right arrow Similar articles in this journal
Right arrow Similar articles in PubMed
Right arrow Alert me to new issues of the journal
Right arrow Download to citation manager
Right arrow reprints & permissions
Citing Articles
Right arrow Citing Articles via HighWire
Right arrow Citing Articles via Google Scholar
Google Scholar
Right arrow Articles by Westgard, J. O.
Right arrow Articles by de Verdier, C. H.
Right arrow Search for Related Content
PubMed
Right arrow PubMed Citation
Right arrow Articles by Westgard, J. O.
Right arrow Articles by de Verdier, C. H.

Clinical Chemistry, Vol 23, 1881-1887, Copyright © 1977 by American Association for Clinical Chemistry

Combined Shewhart-cusum control chart for improved quality control in clinical chemistry

JO Westgard, T Groth, T Aronsson and CH de Verdier

We describe the adaptation of the decision limit cumulative sum method (cusum) to internal quality control in clinical chemistry. With the decision limit method, the cusum is interpreted against a numerical limit, rather than by use of a V-mask. The method can be readily implemented in computerized quality-control systems or manually on controls charts. We emphasize the manual application here and demonstrate how the technique can be implemented on existing Shewhart or Levey-Jennings control charts. This permits both cusum and Shewhart control rules to be used simultaneously on a single control chart and also minimizes the data calculations necessary for the cusum method. Computer simulation studies are used to determine the performance characteristics of several different cusum rules, alone and in combination with a Shewhart rule. These studies indicate that improvements in existing quality-control systems should be possible by addition of this simple cusum method and by use of a combined Shewhart- cusum control chart. This should be particularly advantageous when introducing the cusum method in laboratories with manual quality- control systems.


The following articles in journals at HighWire Press have cited this article:


Home page
 J DAIRY SCIHome page
N. R. St-Pierre and B. Cobanov
Optimal Sampling Schedule of Diet Components: Model Robustness to Departure from Assumptions
J Dairy Sci, December 1, 2007; 90(12): 5395 - 5404.
[Abstract] [Full Text] [PDF]

Home page
 J. Thorac. Cardiovasc. Surg.Home page
E. H. Blackstone
Monitoring surgical performance
J. Thorac. Cardiovasc. Surg., December 1, 2004; 128(6): 807 - 810.
[Full Text] [PDF]

Home page
 Am J EpidemiolHome page
M. Trevisan, R. Browne, M. Ram, P. Muti, J. Freudenheim, A. M. Carosella, and D. Armstrong
Correlates of Markers of Oxidative Status in the General Population
Am. J. Epidemiol., August 15, 2001; 154(4): 348 - 356.
[Abstract] [Full Text] [PDF]

Home page
 Clin. Chem.Home page
J. Dechert and K. E. Case
Multivariate approach to quality control in clinical chemistry
Clin. Chem., September 1, 1998; 44(9): 1959 - 1963.
[Abstract] [Full Text] [PDF]

Home page
 Clin. Chem.Home page
A. S. Neubauer
The EWMA control chart: properties and comparison with other quality-control procedures by computer simulation
Clin. Chem., April 1, 1997; 43(4): 594 - 601.
[Abstract] [Full Text] [PDF]


HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
Copyright © 1977 by the American Association for Clinical Chemistry.