Lo GK, Juhl D, Warkentin TE, Sigouin CS, Eichler P, Greinacher A. Evaluation of pretest clinical score (4 Ts) for the diagnosis of heparin-induced thrombocytopenia in two clinical settings. J Thromb Haemost 2006; 4: 759–65.

Vatanparast R, Lantz S, Ward K, Crilley PA, Styler M. Evaluation of a pretest scoring system (4Ts) for the diagnosis of heparin-induced thrombocytopenia in a university hospital setting. Postgrad Med. 2012 Nov;124(6):36-42.

Dr. Andreas Greinacher

4Ts Score for Heparin-Induced Thrombocytopenia

thrombocytopenia

platelet_fall_timing

thrombosis

other_causes_thrombocytopenia

Differentiates patients with HIT from those with other causes of thrombocytopenia.

HIT vs other causes of thrombocytopenia.

4Ts for HIT

Calvin Hwang, MD, is a clinical assistant professor in the department of orthopaedic surgery at the Stanford University School of Medicine. A native Californian, Dr. Hwang grew up in San Diego and attended Stanford University before venturing off to Case Western Reserve University School of Medicine, where he received his medical degree. He completed his residency at the Stanford/Kaiser Emergency Medicine program and fellowship in sports medicine at Stanford. He is currently a team physician for the Golden State Warriors, Stanford Football and Stanford Volleyball.

Calvin Hwang, MD

The 4Ts Score is a clinical scoring system to differentiate patients with HIT from those with other causes of thrombocytopenia.

HIT Expert Probability (HEP) Score

Corrected Count Increment (CCI) 

ISTH Criteria for DIC

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