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Heparin-induced thrombocytopenia (HIT) is a profoundly dangerous, potentially lethal, immunologically mediated adverse drug reaction to unfractionated heparin or, less commonly, to low-molecular weight heparin. Some patients with HIT develop serious thrombotic complications like limb ischemia and gangrene, while others may not develop such complications. Current laboratory diagnostic tools incur significant time delays before confirming HIT, therefore upon clinical suspicion, treatment of HIT should start immediately. In this review, the authors highlight heparin-induced thrombocytopenias risk factors, clinical presentation, pathophysiology, diagnostic principles, and treatment.