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Prenatal biochemical screening for neural tube defects
1Laboratoire de Biochimie, Hôpital Ambroise Paré, 9 Avenue du Général de Gaulle, 92104 Boulogne Cedex, France. francoise.muller@apr.ap-hop-paris.fr
Summary
Neural tube defects (NTDs), linked to folate deficiency, are screened using maternal serum alpha-fetoprotein (AFP) and ultrasound. Expert fetal scanning and amniocentesis aid diagnosis in high-risk cases.
Area of Science:
- Obstetrics and Gynecology
- Prenatal Diagnostics
- Biochemical Screening
Background:
- Neural tube defects (NTDs) are associated with folate deficiency.
- NTD prevalence varies globally, affecting 0.5 to 6 per 1,000 births.
Purpose of the Study:
- To outline current screening methodologies for neural tube defects.
- To differentiate between general population and high-risk group screening strategies.
Main Methods:
- General population screening utilizes maternal serum alpha-fetoprotein (AFP) testing and ultrasound.
- High-risk group screening involves expert sonographer fetal scanning.
- Amniocentesis with acetylcholinesterase electrophoresis is employed for ambiguous ultrasound findings.
Main Results:
- Maternal serum AFP screening and ultrasound are complementary for general population screening.
- Expert fetal scanning is crucial for accurate diagnosis in high-risk individuals.
- Amniocentesis provides a definitive diagnosis when ultrasound interpretation is challenging.
Conclusions:
- Biochemical screening for NTDs involves a two-tiered approach.
- Combined screening methods enhance detection rates.
- Diagnostic confirmation may require invasive procedures like amniocentesis.