As parents, it’s natural to want the best for your child’s health. You may have heard about MTHFR gene variants or heavy metal testing and wondered whether your child should be tested. There is a lot of information online and in adult medicine, sometimes parents are tested, and it can be confusing. As pediatricians, we do not routinely recommend these tests, and here’s why.
Understanding MTHFR Gene Variants
MTHFR (methylenetetrahydrofolate reductase) is a gene that helps the body process folate (Vitamin B9), which is essential for cell growth and metabolism. Everyone has two copies of this gene, and variations in the gene are common—about 40% of people have one. A variant may slightly decrease the body’s ability to process folate, but in most cases, the body still processes enough for normal function.
Most people with an MTHFR variant do not experience any symptoms or health issues, which is why routine testing is not useful. There is no specific treatment for having an MTHFR variant, and knowing your status does not change medical care. The more meaningful test, if someone has concerning symptoms, is a homocysteine level, as MTHFR-related issues only become relevant if homocysteine is elevated. However, this is still very rare in children.
Should my child be tested for MTHFR Gene Variants?
Based on guidance from the American Academy of Pediatrics (AAP), MTHFR testing is not recommended in children because it does not provide useful or actionable medical information for children. Variations in the MTHFR gene are very common in the general population and, by themselves, do not cause disease. Knowing whether a child has an MTHFR variant does not change medical management, does not predict health problems, and does not guide treatment. Research in pediatrics has shown that MTHFR variants are not a cause of developmental delays, behavioral concerns, anxiety, ADHD, autism, or most other medical symptoms. They also do not reliably predict blood clot risk in children. Because of this, testing can create unnecessary worry without providing any information to help a child. We specifically recommend not testing for MTHFR in children, even when parents have been tested or when there is a family history and instead we focus on symptoms that a child does have and things we can test or do that are helpful and guide us to decisions that can benefit children. Additionally, even when an MTHFR variant is present, children with a normal diet do not need special supplements or treatment beyond standard age-appropriate nutrition.
Should I Give My Child More Folate?
If your child has no symptoms or folate deficiency, there is no need to supplement with extra folate as a precaution. A well-balanced diet that includes vegetables, fruits, whole grains, lentils, beans, and fortified cereals provides enough folate for healthy development. If your child is ever found to be deficient, your pediatrician will guide you on the right approach.
Heavy Metals and Children’s Health
Heavy metal exposure can be concerning, but routine testing for metals like mercury, arsenic, and cadmium is not recommended unless there is a clear risk factor or symptoms. These exposures are rare, and our daily environment contains only trace amounts that the body naturally eliminates.
To reduce unnecessary exposure, parents can take simple precautions:
- Wash fruits and vegetables thoroughly.
- Avoid excessive fruit juice consumption, as some juices have been found to contain small amounts of heavy metals.
- Provide a variety of foods to prevent overexposure to any single source.
- Ensure your drinking water is safe by checking with your local health department.
Heavy Metals in Vaccines
Some parents worry about heavy metals in vaccines, but routine childhood vaccines do not contain harmful levels of heavy metals. Thimerosal, a mercury-based preservative, was removed from most vaccines in the early 2000s, and the trace amounts used in some multi-dose flu vaccines (our office uses single dose prefilled syringes) have not been shown to cause harm. The benefits of vaccines in preventing serious diseases far outweigh any theoretical risks from minimal exposure.
Lead Exposure and Testing
Unlike other heavy metals, lead exposure remains a real concern in certain situations. Children are routinely tested for lead exposure at 1 and 2 years old, or later if they are at risk. Risk factors include:
- Living in a home built before 1978 with chipping or peeling paint.
- Using imported pots, pans, or toys that may contain lead-based coatings.
- Having a caregiver who works in jobs with lead exposure, such as construction or battery manufacturing.
If you are concerned about lead in your home, talk to your pediatrician about testing and prevention strategies.
Final Thoughts
We understand that navigating health information can be overwhelming, and we are here to support you. While MTHFR variants and heavy metals are widely discussed online, routine testing is not needed in most cases. If you ever have concerns about your child’s health, we encourage you to reach out. We are always happy to discuss evidence-based guidance to help your child grow up healthy and strong.