4Ts Score — Heparin-Induced Thrombocytopenia is a coagulation tool commonly applied in Hematology. Pretest clinical probability for HIT from thrombocytopenia pattern, timing, thrombosis sequelae, and alternative diagnoses (0–8). Use the interactive calculator for inputs, limitations, and primary references.

Not a substitute for clinical judgment. Verify critical values with primary literature, local protocols, and specialist input when appropriate.