Terminology
- Polymorphisms
- Alternate phenotypes.
Genetic Polymorphisms
Serum B12 concentrations may be influenced by specific genetic polymorphisms or mutations; currently, more than 15 single nucleotide polymorphisms are known to influence serum B12.
Additionally, specific genetic polymorphisms41 and recent treatment with antibiotics may result in false normal MMA levels,42 and MMA is also elevated with impaired renal function.