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Some time ago, we converted from using serum to using Li-heparin plasma for virtually all in-patient chemistries, but we still receive serum from external clients. Therefore, we generated reference range data for both, and the results were: Serum potassium: 3.3-5.3 mmol/L Plasma potassium: 3.3-4.6 mmol/L I do not believe that we use different reference ranges for any other analytes. Roger L. Bertholf, Ph.D. Associate Professor of Pathology Director of Clinical Chemistry & Toxicology University of Florida Health Science Center/Jacksonville > -----Original Message----- > From: Dr. Pavel Mikulka [mailto:[log in to unmask]] > Sent: Saturday, December 07, 2002 3:47 AM > To: [log in to unmask] > Subject: Re: Are serum potassium measurements acceptable? > > > These problems were noted in March "20. Difference in blood > potassium results". We use Li-heparin plazma only for > dialysed patients because of unstable samples, and centrifuge > them for 15 minutes at least, 3000 rpm, to avoid presence of > an excessive amount of platelets. For routine analyses we use > serum in plastic sample tubes with no gel and problems are as > small as possible. > But it would be very interesting to have read some article > concerning about comparison of various analytes in serum and > plazma (Li-heparin mainly or others). If someone would know > about it please add your response to the conference. I have > read it only in Tietz but there are few facts. > > Pavel Mikulka > > ------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/ > ------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/