• Vivek Kataria, Leanne Moore, Sarah Harrison, Omar Hernandez, Nathan Vaughan, and Gary Schwartz.
• Department of Pharmacy, Baylor University Medical Center, Dallas, TX.
• Crit. Care Med. 2020 Feb 1; 48 (2): e82e86e82-e86.

ObjectivesHeparin-induced thrombocytopenia is a recognized concern in patients on extracorporeal life support. The purpose of this study was to evaluate the applicability of an enzyme-linked immunosorbent assay optical density threshold less than 1 to rule out heparin-induced thrombocytopenia in patients on extracorporeal membrane oxygenation.DesignRetrospective, single-center study.SettingPatients were recruited from a prospectively maintained database of all patients on extracorporeal membrane oxygenation from 2012 to 2018 at a tertiary referral center.PatientsForty-seven patients on extracorporeal membrane oxygenation support.InterventionsThe primary objective was to evaluate the application of enzyme-linked immunosorbent assay optical density thresholds and the serotonin release assay in patients on extracorporeal membrane oxygenation. Patients were divided into two cohorts, serotonin release assay negative and serotonin release assay positive. In order to perform a sensitivity and specificity analysis of enzyme-linked immunosorbent assay optical density thresholds, heparin-induced thrombocytopenia negative was defined as an optical density less than 1.0 and heparin-induced thrombocytopenia positive as an optical density greater than or equal to 1.0.Measurements And Main ResultsUtilizing the prespecified optical density thresholds, a specificity and negative predictive value of 89% and 95% were achieved, respectively.ConclusionsThis assessment has helped to identify optical density thresholds for patients undergoing extracorporeal membrane oxygenation. Our data suggest that an optical density threshold of 1.0 may aid clinicians in objectively ruling out heparin-induced thrombocytopenia without sending a confirmatory serotonin release assay. Increasing the optical density threshold to 1.0 resulted in a high specificity and negative predictive value.

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