 When venous thromboembolism occurs when a patient is experiencing transient major risk factors such as prolonged immobility , surgery , or trauma , testing for thrombophilia is not appropriate because the outcome of the test would not change a patient 's indicated treatment . In 2013 , the American Society of Hematology , as part of recommendations in the Choosing Wisely campaign , cautioned against overuse of thrombophilia screening ; false positive results of testing would lead to people inappropriately being labeled as having thrombophilia , and being treated with anticoagulants without clinical need 
