HITT stands for which condition?

• A. Heparin-Induced Thrombocytopenia Thrombosis
• B. Heparin-Induced Thrombotic Toxicity
• C. Hemolytic Induced Thrombosis
• D. Hypersensitivity-Induced Thrombocytopenia

Answer: (A)

HITT reflects an immune-mediated reaction to heparin that causes both a drop in platelets and the formation of clots. The name emphasizes the two main features: thrombocytopenia and thrombosis that occur after heparin exposure. Antibodies develop against the PF4-heparin complex, activating platelets and driving a prothrombotic state even though heparin is an anticoagulant. This paradox—low platelets with new or worsening clots—is what makes HITT distinctive. Because of this mechanism, stopping heparin promptly and switching to a non-heparin anticoagulant is the typical management, with confirmation testing for anti-PF4–heparin antibodies and careful clinical monitoring. Other options don’t capture the same immune-mediated link between heparin exposure, thrombocytopenia, and thrombosis.