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With difficulty. Formulae based on urine urea excretion are flawed, because the contribution by urea to urinary nitrogen excretion can vary between approximately 60-90%, and not predictably. The only sure way is by measuring urine nitrogen. The problem is compounded in ITU patients in whom changing body water and plasma urea concentration may be occurring: their contribution can often only be estimated. There is extensive literature on this. WM At 08:51 04/03/2003 +0000, Patel Bharat wrote: >Hi >Can someone tell me how I can do nitrogen balance? >This is to carry out on patients in ITU whom I hope majority will be on >infusion. >Is it to measure urine urea + a formulae? > >Bharat > > > >-------------------------------------------------------------------------- >The information contained in this message is confidential and is intended >for the addressee only. If you have received this message in error or there >are any problems please notify the originator immediately. The unauthorised >use, disclosure, copying or alteration of this message is strictly >forbidden. This mail and any attachments have been scanned for viruses prior >to leaving Barts & The London NHS Trust network. Barts & The London NHS >Trust will not be liable for direct, special, indirect or consequential >damages arising from alteration of the contents of this message by >a third party or as a result of any virus being passed on. >-------------------------------------------------------------------------- > >------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/ From: Dr William J Marshall Reader and Hon Consultant in Clinical Biochemistry GKT School of Medicine London SE5 9PJ UK telephone: 020 7346 3275 facsimile: 020 7737 7434 email: [log in to unmask] ------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/