Iwfal I got the 100ng/ml=20 times upper limit of normal from the Alexion data. <A HREF="http://www.investorshub.com/boards/replies.asp?msg=10670854" target="_blank">http://www.investorshub.com/boards/replies.asp?msg=10670854</A> (Alexion link now outdated) “These data support recent publications of other large trials showing that a peak CK-MB release of greater than 100 ng/ml (20 times the upper limit of normal) correlates strongly with mortality in CPB patients," What am I missing here?