Final answer:
Heparin is safe to use during pregnancy because it does not cross the placenta, thus it poses no threat to the fetus, unlike warfarin, which can cause serious birth defects. Low molecular weight heparins are preferred for anticoagulation during pregnancy.
Step-by-step explanation:
Yes, heparin is considered safe for use during pregnancy. This is because heparin does not cross the placenta and thus does not affect the developing fetus. On the other hand, warfarin, which is another anticoagulant, can cause serious birth defects when taken during pregnancy, including mental health, growth restriction, nasal hypoplasia, and opthalmic abnormalities.
In contrast, low molecular weight heparins are preferred over warfarin and have been shown to be safe for both the mother and the fetus in preventing thromboembolism during pregnancy. Additionally, warfarin therapy should be avoided by women who are pregnant or planning to become pregnant, thereby necessitating a switch to low molecular weight heparins if anticoagulation therapy is indicated.