Obstetrics & Gynecology · 3 h ago
Parental B12 and folate levels associated with birth-defect risk
A prospective cohort study measured parental vitamin B12 and folate before conception in 3,032 couples, and maternal levels during early pregnancy in 17,765 women. Higher parental B12 levels were associated with fewer birth defects, but the observational findings are uncertain and do not support changes in clinical practice.
- Higher maternal preconception B12 was associated with lower odds of defects.
- Paternal B12 and folate estimates were not conclusive.
- Observational findings do not support practice changes.
A prospective cohort study examined whether parental vitamin B12 and folate levels around conception were associated with structural birth defects. Researchers measured levels in 3,032 couples less than four months before conception and in 17,765 women within the first four months of pregnancy. Birth defects were identified in 73 and 327 children in the respective cohorts; heart defects were the most common. The analysis accounted for several potential confounders.
In the preconception cohort, higher maternal B12 was associated with lower odds of birth defects than lower levels (odds ratio 0.62; 95% CI 0.44–0.88). The estimate for paternal B12 was also lower but not statistically conclusive (odds ratio 0.79; 95% CI 0.62–1.03). Higher folate levels showed a similar pattern, without clear statistical significance. In the pregnancy cohort, birth defects were less frequent with higher maternal B12 and folate levels.
A Norwegian expert cited in the report described the findings as of limited clinical significance. The observational design cannot establish causality, and the source states that the associations are too uncertain to justify changes in practice; randomized controlled studies would be needed to address the question.
In practice
For people planning pregnancy and pregnant women, the cohort reports associations between higher parental preconception B12 and lower birth-defect occurrence, with a statistically clear association for maternal B12 but not paternal B12; folate findings were also not statistically conclusive. Because this is observational evidence, it cannot establish that nutrient levels caused the differences. The cited expert considers the findings too uncertain to support changes in clinical practice, and randomized controlled studies are needed.
AI-generated clinical interpretation · Not editor-reviewed
Is this summary clinically accurate?
Help fellow clinicians: your rating sends inaccurate summaries straight to our editors.
Sign in to rate this summary →Source
Tidsskrift for Den norske legeforening: Vitamin B12, folat og medfødte misdannelser ↗This is an automated AI-condensed summary that has not yet been reviewed by an editor. Always consult the full item at the original source.