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AU is absorbance units, therfore using the molar extinction coefficient for bilirubin you could work it out. However the guidelines use the procedure of Chalmers and has validated the cut-off in terms of AU which has the benefit of being directly comparable to the cut-off. Ian Watson ------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/