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I'm afraid that I humbly disagree with William I would have thought that e.g. sodium, which is a precisely defined entity was an analyte, which others, e.g cholesterol, alk phos are measurands are we measure them without knowing exactly what species we are measuring. Cathryn Corns Head of Biochemistry Southend Hospital 01702 435555 ext 4058 -----Original Message----- From: William Marshall [mailto:[log in to unmask]] Sent: 24 December 2003 11:08 To: [log in to unmask] Subject: Re: analytes & measurands - a Christmas quiz They are analytes. Their concentrations/activities are measurands. Seasonal greetings to fellow wordsmiths. WM At 10:01 24/12/2003 +0000, JG MIDDLE wrote: >Hi chaps > >Some recent postings and discussions with a training course class this >year, have prompted me to pose some Christmas questions. I have a >small side bet on who will respond first! > >My purpose is to stimulate debate about the words we use to describe >the 'things' we 'measure' and whether we share a common understanding >of them. I am not an expert, I may not be phrasing the questions in >the right way, and I don't know what the right answers are, but the >reponses might be interesting! > >The following is a list of some common 'tests' in most labs' repertoire >(assume all are serum/plasma/whole blood as appropriate). > >[1] alkaline phosphatase >[2] cholesterol >[3] Ca125 >[4] free T4 >[5] HbA1c >[6] oestradiol >[7] Troponin I >[8] TSH >[9] SHBG >[10] sodium > >In each case, can they be described as 'analytes' or 'measurands'? > >Is this is a silly question because the terms are equivalent, or is it >a highly pertinent one as they have different meanings, or does this >only matter to the 'anoraks'? > >And how does our understanding of what is being 'tested for' or >'measured' depend on the method of analysis and the 'signal-producing >entity' within it? > >Happy Christmas! > >Jonathan Middle > > > >UK NEQAS Birmingham >tel 0121 414 7300, fax 0121 414 1179 >This message is intended only for the above named recipient(s). >Message content may be confidential and privileged. If it comes to you >in error please inform the sender and delete it from your system. The >opinions expressed are mine alone and do not necessarily represent >those of UK NEQAS Birmingham, the UK NEQAS Organisation, the University >Hospital Birmingham NHS Trust or University of Birmingham. > >------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. 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