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Hi all, We measure serum/Plasma Ferritin for several reasons and one of them is genetic testing for haemoglobinopathy. We measure Ferritin on Roche Elecsys 2010 with their recommendation in using serum, Li-, Na-heparin, K3-EDTA, and sodium citrate as acceptable tubes. We have 2 different concentrations of K in EDTA tubes; the first one is K2- EDTA and the second is K3-EDTA. Has anyone done a study on Elecsys to compare K2-EDTA with K3-EDTA? Or can they be used interchangably on Elecsys 2010? Does anybody have information of ferritin stability on whole blood, especially if the blood is not separated for more than one day? Your informations are valuableto us. Thank you. Best regards, Dr. Asila Al-Musherifri Chemical pathologist Al-Nahdha Hospital Sultanate of Oman ------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/