Sep

18

2021

What’s a better test for vitamin B12 deficiency: methylmalonic acid (MMA) or homocysteine?

By William Aird

Both markers are highly sensitive, but MMA is more specific (for example, homocysteine levels may also be increased in patients with folate deficiency). MMA values considered high vary from 0.28 to 0.75 mcmol/L Learn more here.