Scoring Systems for HIT

Various scoring systems to estimate the probability of HIT based upon clinical information have been published, usually for the purpose of evaluating new laboratory tests for HIT (Greinacher et al., 1994; Pouplard et al., 1999; Alberio et al., 2003). These systems have included the platelet count recovery following heparin cessation, which limits their applicability for judging the clinical likelihood of HIT in "real time" when a thrombocytopenic patient receiving heparin is first evaluated. Further, these scoring systems were developed before various features of the timing and severity of platelet count fall in HIT were understood.

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