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What diagnostic tests for B12?

Discussion in 'Diagnostic Guidelines and Laboratory Testing' started by Dreambirdie, Jun 1, 2015.

  1. Dreambirdie

    Dreambirdie work in progress

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    N. California
    Could someone remind me which tests are best to test B12 levels.... is it homocysteine and MMA--as in methylmalonic acid?

    Thanks in advance for your response.
     
  2. Bead Dog

    Bead Dog

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    Both of those tests can be done, but I think MMA gives a better indication of deficiency at a cellular level. I've read that urine MMA test is more sensitive than blood serum MMA.
     
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  3. Valentijn

    Valentijn Senior Member

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    @Dreambirdie - There's also holotranscobalamin, which is supposed to measure the amount taken up by cells, or that can be taken up by cells. Or something :p
     

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