Venous thromboembolism (VTE), which includes deep venous thrombosis (DVT) and pulmonary embolism, are among the leading causes of maternal morbidity and mortality, with an incidence of approximately 0.48-1.1 per 100 000 deliveries. [1][2][3] Pregnancy and the puerperium are well-established risk factors for VTE. [4][5][6] It is accepted that there is a 5-to 10-fold increased risk of thrombus formation during pregnancy and the postpartum period, 5-7 with an incidence of VTE in the range of 0.5-2 per 1000 pregnancies. [8][9][10] While the postnatal period is commonly considered to have the highest incidence of VTE, 11 some studies reported a higher antenatal incidence 8 or no difference. 12 In addition, some studies have suggested that the incidence appears to be decreasing over the last four decades, largely due to a decrease of events in the postpartum period. 8,13

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