Atlas One · Host Biology · Scale 07 — System

Heparin-Induced Thrombocytopenia

Heparin-induced thrombocytopenia (HIT type 2) is an immune thrombocytopenia from anti-PF4/heparin IgG; platelet activation → paradoxical thrombosis. Stop heparin; switch to argatroban/bivalirudin/fondaparinux; avoid warfarin initially. 4T score guides clinical probability.

Also known as: HIT, heparin-induced thrombocytopenia, HIT type 2, HITT, heparin thrombocytopenia, anti-PF4 antibody, PF4-heparin antibody, VITT

Scale 07 — SystemScale
draftStatus
2026-06-08Last Reviewed
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heparin-induced-thrombocytopenia

Heparin-Induced Thrombocytopenia

Heparin-induced thrombocytopenia (HIT type 2) is an immune thrombocytopenia from anti-PF4/heparin IgG; platelet activation → paradoxical thrombosis. Stop heparin; switch to argatroban/bivalirudin/fondaparinux; avoid warfarin initially. 4T score guides clinical probability.