As compared to unfractionated heparin, low molecular weight heparins
Low molecular weight heparin has higher subcutaneous bioavailability. Lab monitoring is not required unlike heparin. LMWH has lower risk of osteoporosis and lower incidence of thrombocytopenia. From medical pharmacology padmaja 4th edition Page no 337, 339
Are absorbed more uniformly when given subcutaneously
Require more frequent laboratory monitoring
Cannot be given to patients with heparin induced thrombocytopenia
Predispose to a higher risk of osteopenia
Hematology