Question: what is the difference between low molecular weight heparin and heparin?
Answer: Differences from unfractionated heparin Differences from heparin (i.e. "unfractionated heparin") include: Average molecular weight: heparin is about 15 kDa and LMWH is about 4.5 kDa. ... LMWH has less of an effect on thrombin compared to heparin, but about the same effect on Factor Xa.