Assessment of the 4Ts pretest clinical scoring system as a predictor of heparin-induced thrombocytopenia.

Study Objective: To evaluate the utility of the 4Ts clinical scoring system as a pretest probability method for the detection of heparin-induced thrombocytopenia (HIT).

Design: Prospective observational study.

Setting: Medical and surgical inpatients at a tertiary care medical center.