Practical guide to the diagnosis and management of heparin-induced thrombocytopenia.

Heparin-induced thrombocytopenia (HIT) is an immune reaction to heparin associated with thrombocytopenia, thrombotic risk, and a high risk of morbidity and mortality. Given the frequent use of heparin and the common occurrence of thrombocytopenia in hospitalized patients, the diagnosis and management of HIT is a recurrent challenge in everyday inpatient care. This article presents practical guidance and tools to support the individual clinician providing evidence-based care to patients with suspected or confirmed HIT. The optimal diagnostic evaluation requires the stepwise use of risk-stratification tools and laboratory assays. Management requires the selection and use of nonheparin anticoagulation in these complex patients with both increased thrombotic risk and possible concurrent increased bleeding risk due to thrombocytopenia. Each step in the diagnostic and management process has important nuances and complexities, many of which vary based on patient characteristics and institutional resources. Given the many challenges of HIT care, truly practical management is best achieved when tools are implemented to support the delivery of consistent, high quality, and cost-effective care across health systems.