Professional Development Conference Abstracts Choosing Wisely CSTM Choosing Wisely List Using Blood Wisely Why Give Two When One Will Do? Choosing Wisely Perinatal Recommendations Spotlight on Safety CSTM Education Days Conference Abstracts CSTM 2022 - Abstracts Top Four Abstracts Response of lymphopenic plateletpheresis donors to Covid-19 vaccination. Submitted by Reneé Bazin Fibrinogen Concentrate vs. Cryoprecipitate for Treating Acquired Hypofibrinogenemia in Bleeding Adult Cardiac Surgical Patients: A within-trial economic evaluation of the FIBRES randomized controlled trial. Submitted by Lusine Abrahamyan SARS-CoV-2 seroprevalence in the vaccine era: The Canadian Blood Services Serosurvey January to November 2021. Submitted by Sheila O’Brien Assessment of hemoglobin-oxygen affinity of RBCs of different senescence levels during hypothermic storage in old senior and teenage donors. Submitted by Mahsa Yazdanbakhsh CSTM 2021 - Abstracts Top Four Abstracts - published in Transfusion Medicine Reviews (Volume 36, Issue 1, January 2022) Loss of repeat convalescent plasma donors due to waning anti-SARS-CoV2-2 plaque reduction neutralization test titers (April-December 2020); Authors: Steven Drews, Dana Devine, Janet McManus, Emelissa Mendoze, Kathy Manguiat, Roxie Girardin, Alan Dupuis, Kathleen McDonough, James Lin, David Evans, Chantale Pambrun, Michael Drebot, Heidi Wood. Tracking SARS-CoV-2 seroprevalence among Canadian blood donors; Authors: Sahar Saeed, Steven Drews, Chantale Pambrun, Qi-Long Yi, Lori Osmond, Sheila O'Brien. Optimizing donor screening and eligibility for gbMSM and trans donors: Assessing current donors’ perceptions of alternative screening questions. Authors: Jennie Haw, Hyunjin Woo, Taylor Kohut, William Fisher. Ontario’s Massive Hemorrhage Toolkit; Authors: Stephanie Cope, Jeannie Callum, Katerina Pavenski, Troy Thompson, Allison Collins, Andrew Petrosoniak, Mark McVey, Suzanne Beno, Kimmo Murto, Andrew McDonald, Menaka Pai, Jacob Pendergrast, Lani Lieberman, Avery Nathens. CSTM 2020 - Abstracts Top Four Abstracts - published in Transfusion Medicine Reviews (Volume 35, Issue 1, January 2021) Cold-stored leukoreduced whole blood; no impact of extended time between donation and filtration on in vitro quality; Authors: Peter Schubert, Zhonming Chen, Richard Wambolt, Varsha Bhakta, Brankica Culibrk, William Sheffield, Dana Devine, Ken McTaggart Intravenous Immune globulin IgPro10 and the Risk of Haemolytic Anemia: A US Cohort Study; Authors: Megan Uttley, Amgad Shebl, Christopher Wallenhorst, Toby Simon, Alphonse Hubsch, Ami Patel, Carlos Martinez Directed Donation Utilization and Donor Health Trends at Canadian Blood Services; Authors: Terrie Butler-Foster, Chantale Pambrun, Francine Flahr, Matthew Yan Is 120ug Rh Immune Globulin sufficient for prophylactic treatment of postpartum Rh(D) negative women delivering an Rh(D) positive neonate?; Authors: Nadira Junaid, Julie Fung, Nadine Shehata, Marietta Biscocho