title: Using thrombophilia testing to determine anticoagulation duration in pediatric thrombosis is not cost-effective.
abstract: OBJECTIVE
  To address the cost-effectiveness of thrombophilia testing and treatment strategies among children with a first episode of thrombosis.
  
  
  METHODS
  A 2-year Markov model was developed to evaluate the cost-utility of 3 strategies: (1) no testing, anticoagulate for 3 months, (2) no testing, anticoagulate for 6 months, and (3) testing, anticoagulate 3 or 6 months, based on results. We performed a literature search to estimate clinical probabilities and obtained quality-of-life and cost data from published sources.
  
  
  RESULTS
  Total costs per patient were $7900 for no test, treat for 3 months; $8900 for test, treat based on results; and $12,100 for no test, treat for 6 months. Three months of treatment without testing was the least expensive strategy and also the most effective (1.74 quality-adjusted life-years) by 0.01 to 0.03 quality-adjusted life-years. Cost-utility ratios were sensitive to variation in hospitalization and medication costs, but 3 months, no testing, always remained the preferred choice.
  
  
  CONCLUSIONS
  Universal thrombophilia testing after a first episode of thrombosis is not cost-effective when used solely to determine anticoagulation duration. Therefore, a full panel of thrombophilia studies does not need to be an automatic response at the time of any deep venous thrombosis diagnoses.
authors.affiliation: Center for Innovation in Pediatric Practice, The Research Institute at Nationwide Children's Hospital, Columbus, OH 43205, USA. sarah.obrien@nationwidechildrens.org
authors.forename: Sarah H
authors.initials: SH
authors.lastname: O'Brien
authors.forename: Kenneth J
authors.initials: KJ
authors.lastname: Smith