08/10/2026
🧬 If MTHFR influences folate metabolism, why is testing not routinely recommended?
Because finding a common MTHFR variant does not necessarily tell your practitioner what is happening in your body today.
C677T and A1298C are common genetic variants. Many people carry one or two copies without developing a related health problem or having elevated homocysteine.
In many situations, knowing the genotype would not change the next clinical step.
A practitioner may gain more actionable information by considering:
• Folate status
• Vitamin B12 status
• Homocysteine
• Full blood count
• Kidney and thyroid function
• Diet, medications and symptoms
These results can help show whether there is a current nutritional or metabolic concern that may need attention.
This is also why routine MTHFR testing is generally not recommended as part of an investigation into blood clots or recurrent pregnancy loss. Finding a common variant does not prove that it caused the health concern.
That does not mean MTHFR is irrelevant or that your symptoms should be dismissed. It means the result needs to be interpreted within the wider clinical picture.
Your genes can identify a potential vulnerability.
Your current biochemistry helps show whether that vulnerability may be affecting you now.
Were you offered an MTHFR test, or did you need to request one yourself?