https://medlineplus.gov/lab-tests/methylmalonic-acid-mma-test/
Methylmalonic Acid (MMA) Test: MedlinePlus Medical Test
This test measures the level of methylmalonic acid (MMA) in blood or urine. It's used to check for vitamin B12 deficiency and may be part of newborn screening.
methylmalonic acidmmatestmedlineplusmedical
https://pmc.ncbi.nlm.nih.gov/articles/PMC4725715/
Methylmalonic Acid and Homocysteine as Indicators of Vitamin B-12 Deficiency in Cancer - PMC
Normal or high serum vitamin B-12 levels can sometimes be seen in a B-12 deficient state, and can therefore be misleading. High levels of Methymalonic Acid...
vitamin b 12 deficiency
https://www.mdpi.com/2072-6643/15/13/2980
Association of Serum Vitamin B12 and Circulating Methylmalonic Acid Levels with All-Cause and...
(1) Background: it is unclear whether serum vitamin B12 and circulating methylmalonic acid (MMA) are related with a poor prognosis among individuals with...
serum vitamin b12