Combined oral contraceptives and venous thrombosis: still unravelling ... half a century later...

The risk of Venous Thrombosis in women using combined oral contraceptives is increased and this is well documented. However, there are still some unanswered questions, such as the risk of thrombosis in women who switch combined oral contraceptives, which contraceptives can be considered in women who have inherited thrombophilia and building a risk prediction model for thrombosis in women starting oral contraceptives.