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Dear All, We have recently had a problem with a batch of contaminated paediatric EDTA tubes when measuring ammonia. When we experienced problems previously, we ran a 'blank' sample from the same batch alongside each patient sample, but this practise was not continued routinely. I was just wondering if other labs did/ didn't always run blanks for ammonia, in routine practise? Those that do, what procedures do you follow? Thanks in advance for any help, Brian Brian Tennant Dept Clinical Biochemistry Mayday Healthcare NHS Trust 020 8401 3548 ------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 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/