How we approach VTE prevention in pregnant people with a prior VTE history. “Unprovoked VTE; VTE provoked by hormonal or minor risk factors” is an abbreviated reference to those patients who should receive both antepartum and postpartum LMWH. This group is described in the inclusion criteria for the Highlow study as “Patients with previous objectively confirmed VTE, either unprovoked, in the presence of use of oral contraceptives or estrogen/progestagen use, or related to pregnancy or the postpartum period, or minor risk factors (e.g., long distance travel, minor trauma).”²⁷