ART4 and Thrombocytopenia: Five different presentations of thrombocytopenia following glycoprotein inhibitors administration have been described: 1) acute severe thrombocytopenia within 12 hours of first exposure (platelets <10 × 103/mcL), 2) acute thrombocytopenia within 12 hours of a second exposure, 3) delayed thrombocytopenia (five to seven days after treatment), 4) anaphylaxis after first or second exposure and 5) pseudo-thrombocytopenia [4].