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Updated: Aug 10, 2026
Neural Tube Closure in Mouse Whole Embryo Culture
Published on: October 21, 2011
Diagnosis and prevention of neural tube defects
Robert Birnbacher1, Agnes M Messerschmidt, Arnold P Pollak
1Department of Neonatology and Intensive Care, University Children's Hospital, Vienna, Austria. Robert.Birnbacher@akh-wien.ac.at
Insights
Prevent neural tube defects with folic acid supplementation. Early diagnosis via ultrasound and MRI improves counseling, while food fortification offers a practical approach to folate intake.
Area of Science:
- Obstetrics and Gynecology
- Public Health
- Genetics
Background:
- Neural tube defects (NTDs) like anencephaly and spina bifida are common, severe birth defects with significant mortality and morbidity.
- Incidence of NTDs varies geographically, ethnically, and temporally, occurring in 1-5 per 1000 births.
- Despite proven prevention through periconceptional folic acid, adherence to recommendations remains low.
Purpose of the Study:
- To review advancements in diagnosing neural tube defects.
- To discuss the role of folic acid supplementation and food fortification in NTD prevention.
- To highlight current challenges and consensus gaps regarding folate intake.
Main Methods:
- Review of diagnostic modalities including maternal serum screening (alpha-fetoprotein) and advanced imaging.
- Analysis of public health initiatives, specifically folic acid fortification of grain products.
- Examination of guidelines and research on periconceptional folic acid supplementation.
Main Results:
- Diagnostic capabilities have evolved from blood tests to sophisticated imaging like ultrasound and fetal MRI, enabling earlier and more accurate NTD detection.
- Folic acid fortification of grain products has been adopted by numerous countries, with the US leading since 1996.
- There is ongoing debate regarding optimal folic acid dosage and duration for supplementation.
Conclusions:
- Advanced imaging techniques (ultrasound, MRI) enhance early diagnosis and counseling for NTDs.
- Food fortification is identified as the most practical strategy for ensuring adequate periconceptional folate intake.
- Continued research and consensus-building are needed for optimal folic acid supplementation protocols.
Purpose Of Review:
Neural tube defects, including anencephaly, meningomyelocele and encephalocele, are among the most common birth defects that result in severe mortality and morbidity. Neural tube defects occur with an incidence of 1-5 per 1000 births, showing marked geographic, ethnic and temporal variations. Although clear evidence exists on preventability of a large proportion of neural tube defects by periconceptional folic acid intake, only a low percentage of women are following the recommendations.
Recent Findings:
In the past few decades diagnostic modalities have undergone a change from blood screening tests, such as alpha-fetoprotein, to imaging methods. Ultrasound has become the standard tool for early diagnosis, whereas fetal magnetic resonance imaging has gained importance in evaluating distinct coexisting anomalies of the central nervous system. Since the United States authorized the addition of folic acid to grain products in 1996, many other countries are considering folic acid fortification of their grain products, or have started fortification. Hitherto there is no consensus either to the duration of supplementation or to the best dose.
Summary:
Ultrasound and magnetic resonance imaging offer the possibility of early and accurate diagnosis of neural tube defects, and have therefore improved medical counseling and parents' decision making. Food fortification is the most practical way of ensuring sufficient folate supplementation and is warranted during the periconceptional period.
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