What is the difference between UFH and commercial LMWHs?
UFH has an anti-Xa to anti-IIa ratio of 1:1, while commercial LMWHs have anti-Xa to anti-IIa ratios between 2:1 and 4:1 depending on their molecular size distribution. At present, there is no evidence that the differences in anti-Xa to anti-IIa ratio among the LMWHs in uence clinical outcomes such as recurrent thrombosis or bleeding complications.