@Amw66
https://www.labcorp.com/help/patient-test-info/methylmalonic-acid
Can either blood or urine be used for the MMA test?
In most cases, it is okay to use blood or urine for this test. Sometimes, a healthcare provider may want to test both blood and urine in order to compare the MMA results. Since
homocysteine is a blood test, it may be more efficient and convenient to draw blood for both the MMA and homocysteine tests when they are ordered together.
FMMA test: higher/normal range indicates a deficiency.
Thanks
@Mij
We have had testing done at different times over past 6 years and I keep a spreadsheet to track changes.
As we never seem to be able to get fuller than FBC done at the same time this makes relationships a bit patchy .
B12 has been consistently high ( when supplementing sublingually previously it was simply noted as >2000 and now minimal supplement it's in the 1250s ).
A urine MMA as part of an organic acid panel in 2019 suggested B12 deficiency ( when serum B12 was ,
>2000 and supplementing so perhaps a functional deficiency getting into cells ) , but in 2021 a serum MMA was bang on mid range when B12 was somewhere between 1497 and 1251. So this could reflect a personal " normal" perhaps.
If anything gut is worse now than previously so I would have expected it to be other way around .
Perhaps I am making the mistake of assuming that the ranges distribution is parametric ....
Homocysteine was tested ( but not at same time as B12) and lowish at 6 - weird range of 0-20. I would have thought 0 Homocysteine might be an issue.
Folate and Ferritin are on lowish side of range and have been dropping as B12 drops .
My daughter has MTHFR SNPs ( and MTR / MTRR SNPs ) which would suggest a higher requirement for folate and B12 . Does high B12 serum simply reflect the need for higher levels generally ?
We do have gut issues which will affect absorption of many compounds . GPs don't seem to get this though.
My aunt has very high B12 and very high ferritin ( no heamachromatosis) She can't cope with B12 supplements at all.
There was an argument that you need to load up B12 to get it into the cells ( Bansal amongst others suggests this) . It didn't work for my aunt.