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Something which is linked to this topic and has been mentioned by Steven is the time frame within which samples must reach lab to be centrifuged i.e. the serum/clot contact time. Which is the serum/clot contact time acceptable in your laboratory? What would you do if you receive a sample which has exceeded this time interval? Do you still analyse and issue a disclaimer or reject the sample as not acceptable? I know that there are certain specific analytes (ex PTH and ammonia) which have a short stability, but for the rest of the analytes (routine chemistry) which is the acceptable time? I am also interested to know if you ask for off site centrifugation especially for samples submitted from private practice clinics. Thanks, Ian AHP Medical Laboratory Scientist Clinical Chemistry Lab Pathology Department Mater Dei Hospital MALTA ------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/