Heparin Induced Thrombocytopenia 4Ts ScoreLow score may aid in ruling out HIT(high-negative predictive value)Loading...Platelet Count for Thrombocytopenia?Fall less than 30%, platelet nadir less than 100Fall 30-50%, platelet nadir 10-19+1Fall greater than 50%, platelet nadir 20 or greater+2Timing of Platelet Count Fall?Fall less than 4 days without recent exposure05-10 days fall/not clear/onset greater than 10 days/fall less than 1 day/prior heparin exposure 30-100 days+1Fall less than 4 days without recent exposure+2Are there Thrombosis or other sequelae?None0Progressive/recurrent; non-necrotizing erythematous skin lesions; not proven+1New confirmed; skin necrosis; acute systemic reaction post-IV UFH bolus+2Other possible causes of thrombocytopenia?Definite other etiology0Possible other etiology+1No other apparent etiology+2Indications d'utilisationInformations et précautions