194 The Impact of Prospective Review of Platelet Factor 4 Testing Practices for Suspected Heparin-Induced Thrombocytopenia: An Antithrombotic Stewardship Initiative - J. Harrison Badalamenti; John Lindsley; Jessica Crow; Jessica Chasler; Ivo Francischetti; Rakhi Naik; Michael Streiff; Jennifer Yui; Kathryn E. Dane (Research and Practice in Thrombosis and Haemostasis)