A Practical Guide to Haemostasis

Heparin-Induced Thrombocytopaenia [HIT]


Heparin-Induced Thrombocytopaenia [HIT] is a life-threatening complication of heparin therapy. Two pre-test clinical probability scoring algorithms have been developed to aid with the initial investigation of a suspected case of HIT.

The HIT 4T Score

The '4T' scoring system of Warkentin et al is widely used to predict the risk that an individual with Thrombocytopenia may have HIT.  The 4Ts are:
  - Thrombocytopaenia
  - Timing
  - Thrombosis
  - Other causes of Thrombocytopaenia are not evident.

Click HERE to access the HIT 4T Score algorithm.

The HIT Expert Probability [HEP] Score

The HIT Expert Probability [HEP] score was constructed based upon the opinions of 26 experts in this area.

Click HERE to access the HEP Score algorithm.