The American College of Obstetricians and Gynecologists (ACOG) published evidence-based recommendations for the prevention of DVT and pulmonary embolism in 2007, which were reaffirmed in 2013 (ACOG, 2007). ACOG does not recommend discontinuing hormone therapy or oral contraceptives preoperatively. However, patients undergoing major operative procedures who are on oral contraceptives should receive heparin prophylaxis to reduce their risk of perioperative venous thromboembolism. Risk classification is used to determine appropriate prophylaxis for surgical patients (Guyatt, Akl, Crowther, Gutterman, & Schuünemann, 2012). The recommendations for moderate- to high-risk patients range from the use of mechanical compression devices, preferably intermittent pneumatic compression, to pharmacologic prophylaxis with unfractionated heparin and low-molecular-weight heparin based on the patients’ risk factors including length of operating time, condition, and age. Low-risk patients require no specific prophylaxis, but early ambulation is recommended.