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Reduction in Unnecessary Red Blood Cell Folate Testing by Restricting Computerized Physician Order Entry in the Electronic Health Record.

PURPOSE: The red blood cell (RBC) folate test is a laboratory test with limited clinical utility. Previous attempts to reduce physician ordering of unnecessary laboratory tests, including folate levels, have resulted in only modest success. The objective of this study was to assess the effectiveness and impacts of restricting RBC folate ordering in the electronic health record (EHR).

METHODS: This was a retrospective observational study that took place from January 2010 to December 2016 at a large academic healthcare network in Toronto, Canada. All inpatients and outpatients who underwent at least 1 RBC folate or vitamin B12 test during the study period were included. Ordering an RBC folate test was restricted to clinicians in gastroenterology and hematology. The option to order the test was removed from other physicians' computerized order entry screens in the EHR in June 2013.

RESULTS: RBC folate testing decreased by 94.4% during the study, from a mean of 493.0 ± 48.0 tests per month prior to intervention to 27.6 ± 10.3 tests per month after intervention (P < .001).

CONCLUSIONS: Restricting RBC folate ordering in the EHR resulted in a large and sustained reduction in RBC folate testing. Significant cost savings, estimated at more than a quarter of a million Canadian dollars over 3 years, were achieved. There was no significant clinical impact of the intervention on the diagnosis of folate deficiency.

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