We are in the process of reviewing our PTH reference range. We use the Roche E170. At present we quote a range of 10-50ng/L which was determined locally some years ago. This is in contrast to the range quoted by Roche of 15-65ng/L. Do other Roche users use the range from the kit insert or something else, and if so how was this determined? Kind regards, Susan Troup Senior Biochemist Queen Elizabeth Hospital Gateshead ------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/