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What diagnostic tests for B12?

Dreambirdie

Dreambirdie

work in progress
Messages
5,569
Location
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.
 
B

Bead Dog

Messages
97
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.
 
V

Valentijn

Senior Member
Messages
15,786
@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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