• M Omair Rahman, Emannuel Charbonney, Ryan Vaisler, Abubaker Khalifa, Waleed Alhazzani, Kiera Gossack-Keenan, Allan Garland, Timothy Karachi, Erick Duan, Sean M Bagshaw, Maureen O Meade, Chris Hillis, Peter Kavsak, Karen Born, Lawrence Mbuagbaw, Deborah Siegal, Tina Millen, Damon Scales, Andre Amaral, Shane English, Victoria A McCredie, Peter Dodek, Deborah J Cook, and Bram Rochwerg.
• McMaster University, Hamilton, ON, Canada. omair.rahman@medportal.ca.
• Can J Anaesth. 2024 Aug 1; 71 (8): 113711441137-1144.

PurposeThe ordering of routine blood test panels in advance is common in intensive care units (ICUs), with limited consideration of the pretest probability of finding abnormalities. This practice contributes to anemia, false positive results, and health care costs. We sought to understand practices and attitudes of Canadian adult intensivists regarding ordering of blood tests in critically ill patients.MethodsWe conducted a nationwide Canadian cross-sectional survey consisting of 15 questions assessing three domains (global perceptions, test ordering, daily practice), plus 11 demographic questions. The target sample was one intensivist per adult ICU in Canada. We summarized responses using descriptive statistics and present data as mean with standard deviation (SD) or count with percentage as appropriate.ResultsOver seven months, 80/131 (61%) physicians responded from 77 ICUs, 50% of which were from Ontario. Respondents had a mean (SD) clinical experience of 12 (9) years, and 61% worked in academic centres. When asked about their perceptions of how frequently unnecessary blood tests are ordered, 61% responded "sometimes" and 23% responded "almost always." Fifty-seven percent favoured ordering complete blood counts one day in advance. Only 24% of respondents believed that advanced blood test ordering frequently led to changes in management. The most common factors perceived to influence blood test ordering in the ICU were physician preferences, institutional patterns, and order sets.ConclusionMost respondents to this survey perceived that unnecessary blood testing occurs in the ICU. The survey identified possible strategies to decrease the number of blood tests.© 2024. Canadian Anesthesiologists' Society.

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