Methods and InstrumentsChoosing Daily Labs Wisely in the Hospital: A Novel Tool for Assessing Laboratory Testing AppropriatenessMurphy, Caleb J. MD, MBA; Duran, Alisa M. MD; Diem, Susan J. MD, MPH; Bowman Peterson, Jill M. MDAuthor Information Department of Medicine, University of Nevada-Las Vegas School of Medicine (Dr Murphy); Section of Women's Health (Dr Duran) and General Internal Medicine (Drs Diem and Bowman Peterson), Minneapolis VA Healthcare System, Minneapolis, Minnesota; and Department of Medicine, University of Minnesota Medical School, Minneapolis (Drs Duran, Diem, and Bowman Peterson). Correspondence: Caleb J. Murphy, MD, MBA, University of Nevada-Las Vegas School of Medicine, 1701 W Charleston Ave, Ste 230, Las Vegas, NV 89102 (email@example.com). This study was funded by the American Board of Internal Medicine Foundation through their “Putting Stewardship into Medical Education and Training” grant program. Authors' Contribution: The manuscript has been written, edited, and approved by all of the authors and they ensure the integrity of the manuscript. All authors had access to the data referenced in the manuscript and tables. The authors report no conflicts of interest relevant to the article. Quality Management in Health Care: July/September 2020 - Volume 29 - Issue 3 - p 169-172 doi: 10.1097/QMH.0000000000000258 Buy Metrics Abstract Background: The Minnesota Lab Appropriateness (MLAB) criteria were developed for assessing appropriateness of complete blood counts (CBCs) and serum electrolyte panels (SEPs) ordered for adult inpatients. Methods: Two independent raters used the MLAB criteria to rate appropriateness of labs ordered during 50 hospitalizations through retrospective medical record review. Results: Evaluation of 208 CBCs and 253 SEPs on a 2-category scale (appropriate/inappropriate) resulted in an inappropriate lab rate of 24% and 25% for CBCs and SEPs, respectively. Using a 3-category Likert scale that included an “equivocal” rating to allow for clinical uncertainty, 17% of CBCs and 20% of SEPs were considered inappropriate. Interrater reliability was “substantial” using the dichotomous scale for both CBCs and SEPs. Using the 3-category Likert scale, reliability was “substantial” for CBCs and “moderate” for SEPs. Conclusion: The MLAB criteria identified inappropriate labs at a rate consistent with published figures, with good interrater reliability. © 2020 Wolters Kluwer Health, Inc. All rights reserved.