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4Ts Score For Heparin-Induced Thrombocytopenia
Platelet count fall >50% AND platelet nadir ≥20
Platelet count fall 30–50% OR platelet nadir 10–19
Platelet count fall <30% OR platelet nadir <10
Timing of platelet count fall
Clear onset between days 5–10 OR platelet fall ≤1 day
Prior heparin exposure within 30 days
Consistent with days 5–10 fall, but not clear; onset after day 10 OR fall ≤1 day
prior heparin exposure 30–100 days ago
Platelet count fall <4 days without recent exposure:
Thrombosis or other sequelae
Progressive OR recurrent thrombosis; non-necrotizing skin lesions; suspected thrombosis
New thrombosis OR skin necrosis; acute systemic reaction post-IV heparin bolus:
Other causes for thrombocytopenia
This is not a diagnosis. The calculations that are provided are estimates based on averages.
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