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Titer conversion from decimals, anyone???

Discussion in 'Diagnostic Guidelines and Laboratory Testing' started by Pyr2, Sep 29, 2015.

  1. Pyr2

    Pyr2

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    Hi everyone, I notice most of you talk in titers, i.e. 1:256 or thousands, 2560. Does anyone know how to convert a decimal result? So would 2.5 be 2500? Thanks, I can't seem to get an answer on this and that's what my lab uses (decimals).

    L
     
  2. Jonathan Edwards

    Jonathan Edwards "Gibberish"

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    2.5 does not sound like a titre. A titre is a dilution that gives a positive result. So 1:256 means that you get a positive result even with diluting 256 times. A lot of tests reported with titres are also reported in terms of units of strength - using a different method for measuring the result that gives a quantity rather than a positive or negative.

    In general you cannot compare one scale of result with another - not even for titres. So a titre of 1:256 in one lab does not mean a titre of 1:256 in another lab - it might be 1:64 or 1:100. It may be easier to answer if we know what the test is.
     
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  3. Pyr2

    Pyr2

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    Thanks Jonathan. I was looking at VCA IgG and EBV-EA D. Mine are 3.93 and 3.30 respectively.

    I was reading a study where the individual was over quoted as over 5000 for VCA IgG, and had a EBV-EA of 1:640.
     
  4. Jonathan Edwards

    Jonathan Edwards "Gibberish"

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    I don't think you can make any comparison. Each lab has a different scale. Your results look like ELISA measurements, which do not compare to titres in any direct way.
     
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  5. Ema

    Ema Senior Member

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    You can't compare the two because the testing methodology is totally different.

    Titer testing uses serial dilution.

    ELISA testing produces a number such as you describe.

    Labcorp does both types of testing though.
     
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