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Clinical Chemistry 48: 55-60, 2002;
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(Clinical Chemistry. 2002;48:55-60.)
© 2002 American Association for Clinical Chemistry, Inc.

Compliance of General Practitioners with a Guideline-based Decision Support System for Ordering Blood Tests

Marc A.M. van Wijk1a, Johan van der Lei1, Mees Mosseveld1, Arthur M. Bohnen2 and Jan H. van Bemmel1

1 Institute of Medical Informatics and
2 Department of General Practice, Faculty of Medicine and Health Sciences, Erasmus University Rotterdam, 3000 DR Rotterdam, The Netherlands.

aAddress correspondence to this author at: Institute of Medical Informatics, Faculty of Medicine and Health Sciences, ErasmusUniversity Rotterdam, P.O. Box 1738, 3000 DR Rotterdam, The Netherlands. Fax 31-10-408-9447; e-mail wijk{at}mi.fgg.eur.nl.

Background: Guidelines are viewed as a mechanism for disseminating a rapidly increasing body of knowledge. We determined the compliance of Dutch general practitioners with the recommendations for blood test ordering as defined in the guidelines of the Dutch College of General Practitioners.

Methods: We performed an audit of guideline compliance over a 12-month period (March 1996 through February 1997). In an observational study, a guideline-based decision support system for blood test ordering, BloodLink, was integrated with the electronic patient records of 31 general practitioners practicing in 23 practices (16 solo). BloodLink followed the guidelines of the Dutch College of General Practitioners. We determined compliance by comparing the recommendations for test ordering with the test(s) actually ordered. Compliance was expressed as the percentage of order forms that followed the recommendations for test ordering.

Results: Of 12 668 orders generated, 9091 (71%) used the decision-support software rather than the paper order forms. Twelve indications accounted for >80% of the 7346 order forms that selected a testing indication in BloodLink. The most frequently used indication for test ordering was "vague complaints" (2209 order forms; 30.1%). Of the 7346 order forms, 39% were compliant. The most frequent type of noncompliance was the addition of tests. Six of the 12 tests most frequently added to the order forms were supported by revisions of guidelines that occurred within 3 years after the intervention period.

Conclusions: In general practice, noncompliance with guidelines is predominantly caused by adding tests. We conclude that noncompliance with a guideline seems to be partly caused by practitioners applying new medical insight before it is incorporated in a revision of that guideline.




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