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Disappointingly I only received 12 responses to this posting-surely there must be more Troponin T users than this out there! However, the summary is as follows:- 2 labs use 0.01 (but 1 of these adds a disclaimer as follows: We quote "normal" as <0.01 but comment that results below 0.03 are on the method's sensitivity limit and not necessarily reliable. We checked out the precision at these levels and agree that results are consistently detectable at 0.03 and above. 7 labs use 0.03 2 labs use 0.05 (one of which is evidence based and published in Heart and the other shown locally to be the value that consistently gives a 10%CV). 1 lab uses 0.1 but concedes that their cardiologists use 0.03. Best wishes Ian Barlow Scunthorpe UK ------ACB discussion List Information-------- This is an open discussion list for the academic and clinical community working in clinical biochemistry. Please note, archived messages are public and can be viewed via the internet. Views expressed are those of the individual and they are responsible for all message content. ACB Web Site http://www.acb.org.uk List Archives http://www.jiscmail.ac.uk/lists/ACB-CLIN-CHEM-GEN.html List Instructions (How to leave etc.) http://www.jiscmail.ac.uk/