Factors that increase the chance of deep venous thrombosis (DVT) or blood clots forming during surgery are long surgery, inadequate fluids during surgery, trauma to the legs or thighs and a history of smoking or oral contraceptive use. Birth control pills increase the chance of a clot by six times. Because of this, they should be stopped one month prior to surgery and not restarted until two weeks after surgery.

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Straight Talk about Cosmetic Surgery (Yale University Press Health & Wellness)
Your risk for blood clots during surgery is increased because you are lying on the table without moving. After surgery, you may be confined to bed, also increasing your risk for blood clots. Certain surgeries have a higher risk for blood clots including neurosurgery, orthopedic surgery and gynecological surgery. Surgery is one of the biggest risk factors for deep vein thrombosis (DVT).
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Important: This content reflects information from various individuals and organizations and may offer alternative or opposing points of view. It should not be used for medical advice, diagnosis or treatment. As always, you should consult with your healthcare provider about your specific health needs.