ASH VTE Guidelines: Heparin-Induced Thrombocytopenia (HIT) 

Heparin-Induced Thrombocytopenia (HIT) is a prothrombotic adverse drug reaction. One third to one-half of cases of HIT are complicated by thrombosis, which may be limb- or life-threatening. Recommendations address screening of asymptomatic patients for HIT, diagnosis and initial management of patients with suspected HIT, treatment of acute HIT, and special situations in patients with acute HIT or a history of HIT, including cardiovascular surgery, percutaneous cardiovascular intervention (PCI), renal replacement therapy, and VTE prophylaxis.

In February 2022, these guidelines were reviewed by an expert work group convened by ASH. Review included limited searches for new evidence and discussion of the search results. Following this review, the ASH Committee on Quality agreed to continue monitoring the supporting evidence rather than revise or retire these guidelines at this time. Limited searches and expert review will be repeated annually going forward until these guidelines are revised or retired. Derivative resources will be updated accordingly.