32. Choice D is the correct answer. Heparin and Lovenox do not cross the placental barrier and are generally okay in pregnancy. However, heparin has a much shorter half life than lovenox and can be reversed with protamine sulfate. Most obstetricians prefer their patients to be switched to from Lovenox to Heparin around 37 weeks because if there is any bleeding problems around delivery or a C-Section. Coumadin does cross the placental barrier.
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