Heparin Induced Thrombocytopenia Pre-Test Scoring System

Heparin Induced Thrombocytopenia Pre-Test Scoring System
1. Thrombocytopenia: [select name="Q1" value="0 points - Platelet Count decreased less than 30 percent from baseline with nadir less than 10,000=0|1 point - Platelet Count decreased 30-50 percent from baseline with nadir 10-20,000=1|2 points - Platelet Count decreased more than 50 percent from baseline with nadir greater than 20,000=2"]
2. Timing after onset of current Heparin course: [select name="Q2" value="0 points - Onset within 4 days and no prior Heparin exposure before this episode=0|1 point - Probable onset days 5-10 (or less than 1 day if prior exposure Heparin 30-100 days ago)=1|2 points - Clear onset days 5-10 (or less than 1 day if prior exposure Heparin within last 30 days)=2"]
3. Thrombosis: [select name="Q3" value="0 points - No thrombosis=0|1 point - Progressive, recurrent or suspected clot=1|2 points - Confirmed new clot, skin necrosis and systemic reaction=2"]
4. Alternative causes of thrombocytopenia: [select name="Q4" value="0 points - Definite alternative cause of Thrombocytopenia=0|1 point - Possible alternative cause of Thrombocytopenia=1|2 points - No other alternative cause of Thrombocytopenia=2"]
Score --> [calc memo="number" value="score1=(Q1)+(Q2)+(Q3)+(Q4)"]
Interpretation --> [calc memo="result" value="score2=(Q1)+(Q2)+(Q3)+(Q4);score2>5?'High probability (greater than 80 percent risk) of Clinically Significant HIT':score2>3?'Intermediate probability of Clinically Significant HIT':'Low probability (less than 5 percent risk) of Clinically Significant HIT)'"]
[checkbox memo="display/hide references" name="footnotes" value=""][conditional field="footnotes" condition="(footnotes).is('')"]
reference:  [link url="http://www.ncbi.nlm.nih.gov/pubmed/16634744" memo="#1"] Lo GK, Juhl D, Warkentin TE, Sigouin CS, Eichler P, Greinacher A. Evaluation of pretest clinical score (4 T's) for the diagnosis of heparin-induced thrombocytopenia in two clinical settings. J Thromb Haemost. 2006 Apr;4(4):759-65.[/conditional]