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LMWHs are preferred for antenatal thromboprophylaxis due to effectiveness and safety over UFH. Prolonged UFH use may lead to osteoporosis, while LMWH carries lower risk of heparin-induced thrombocytopenia.
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LMWH Vs UFH during pregnancy RCOG Guideline • LMWHs are the agents of choice for antenatal thromboprophylaxis, these are at least as effective as and safer than UFH • Prolonged UFH use during pregnancy may result in osteoporosisand fractures but this risk is very low with LMWH. • The risk of heparin-induced thrombocytopenia is substantially lower with LMWH