The 4 Ts score is a short art of memory technique used to easily memorize the four most important parts of HIT diagnosis. Let's enumerate them one by one:
Magnitude of Thrombocytopenia.
Typically for HIT, the platelets fall exceeds 50%, but the lowest point doesn't go below 20 × 10⁹/ L.
Timing.
HIT usually starts 5-10 days after the start of heparin treatment.
Thrombosis.
Newly diagnosed thrombosis.
OTher causes of thrombocytopenia.
There is no other probable cause.
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