| Journal of Clinical Medicine Research, ISSN 1918-3003 print, 1918-3011 online, Open Access |
| Article copyright, the authors; Journal compilation copyright, J Clin Med Res and Elmer Press Inc |
| Journal website http://www.jocmr.org |
Case Report
Volume 4, Number 1, February 2012, pages 68-72
Heparin Induced Thrombocytopenia: Case Presentation and Review
Table
| Pretest probability of HIT | Score |
| Thrombocytopenia | |
| Platelet count fall > 50% and nadir > 20,000 | 2 points |
| Platelet count fall 30 - 50 % or nadir 10 to 19,000 | 1 point |
| Platelet count fall < 30% or nadir < 10,000 | 0 points |
| Timing of platelet count fall | |
| Clear onset between days 5 and 10 or platelet count fall at ≤ 1 day if prior heparin exposure within the last 30 days | 2 points |
| Consistent with fall at 5 to 10 days but unclear (eg, missing platelet counts), onset after day 10, or fall ≤ 1 day with prior heparin exposure within 30 to 100 days | 1 point |
| Platelet count fall at < 4 days without recent exposure | 0 points |
| Thrombosis | |
| Confirmed new thrombosis, skin necrosis, or acute systemic reaction after IV unfractionated heparin bolus | 2 points |
| Progressive or recurrent thrombosis, non-necrotizing (erythematous) skin lesions, or suspected thrombosis which has not been proven | 1 point |
| None | 0 points |
| Other causes | |
| None apparent | 2 points |
| Possible | 1 point |
| Definite | 0 points |