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Given the discrepancy shown by EQA samples between progesterone levels measured on various platforms, are there any Roche users who have some sort of evidence for the cutoff levels that they provide as a guide for users? Does anyone know which method was used to determine the often quoted cutoff of 15 nmol/l, below which ovulation is unlikely to have occurred, with a grey zone between 15 and 30? Regards Marieke Dr Marieke Jordaan Consultant Chemical Pathologist Mid-Yorkshire Trust Email: [log in to unmask] Tel: (01924) 317060 or ext 57060 PA, Diane Blakeston: (01924) 317056 or ext 57056 This e mail or any attachments to it may contain legally privileged or confidential data. You should not forward it to anyone without reference to the Trusts Confidentiality and E Mail policies for guidance. If you are not the intended recipient, please notify the author immediately by telephone or by replying to this e-mail and then delete all copies of the e-mail on your system. If you are not the intended recipient, you must not use, disclose, distribute, copy, print or rely on this e-mail. This email or any attachments to it may contain legally privileged or confidential data. You should not forward it to anyone without reference to the Trusts Confidentiality and EMail policies for guidance. If you are not the intended recipient, please notify the author immediately by telephone or by replying to this e-mail and then delete all copies of the e-mail on your system. If you are not the intended recipient, you must not use, disclose, distribute, copy, print or rely on this e-mail. ------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 who posts and they are solely responsible for all message content. The ACB does not monitor posts. ACB Web Site http://www.acb.org.uk Green Laboratories Work http://www.laboratorymedicine.nhs.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/