<prompt> As compared to unfractionated heparin, low molecular weight heparin -Are absorbed more uniformly when given subcutaneouslyRequire more frequent lab monitoringCan be given to patients with heparin induced thrombocytopeniaA higher risk of osteopenia  <response>: Ans. is a i.e., Are absorbed more uniformly when given subcutaneously o Unfractionated heparin binds to several plasma proteins, therefore it has less predictable dose-response profile when administered sc or iv. o On the other hand, LMW heparins are less protein bound and have a predictable dose response profile when administered sc or iv. About other options o Since aPTTclotting time are not prolonged much with LMW heparins, laboratory monitoring is not needed. o LMW heparins are unsuitable for HIT as antibody may be cross-reactive. Agent of choice in HIT are direct thrombin inhibitors like hirudin, lepirudin, bivalirudin. o Osteoporosis osteopenia occurs as a dose related side effect of unfractionated heparin. The relative risk with LMW heparin is not yet estabilished. 