Understanding Neural Tube Defect Prevention
Neural tube defects (NTDs) are serious birth defects affecting the brain and spine. They occur very early in pregnancy, often before a woman knows she is pregnant.
Importance of Folate
Folate, a B vitamin (also known as folic acid when used in supplements), plays a critical role in the development of the neural tube. Adequate folate levels are essential to reduce the risk of NTDs.
Recommended Supplementation Timing
To effectively prevent neural tube defects, supplementation should begin before conception. The neural tube closes around 21-28 days after conception. Therefore, recommendations typically include:
- Starting folate supplements at least one month prior to conception.
- Continuing supplementation through the first trimester (approximately the first three months of pregnancy).
This comprehensive timeframe ensures sufficient folate levels are available during the critical period of neural tube development.
Why Folate, Not Zinc?
While zinc is also important for fetal development, scientific evidence strongly links folate specifically to the prevention of neural tube defects. Studies show a significant reduction in NTDs with appropriate folic acid intake.
Conclusion on Recommended Supplementation
Based on medical recommendations for preventing neural tube defects, taking folate supplements from one month before conception through the first three months of pregnancy is advised.
Important Questions from Congenital Disorders
- To prevent recurrence, expectant mothers with a previous fetus with neural tube defect should receive folic acid daily at the dose of :
Consider the following statements regarding non-invasive prenatal screening (NIPS) for screening high risk pregnancies for aneuploidies:
1. It is carried out on maternal blood.
2. It is done before 10 weeks gestation.
3. It has a negative predictive value of about 98%.
4. Invasive testing is needed for confirmation of a positive test.
Which of the statements given above are correct?
- The risk of Down syndrome is 100% in the offspring, if:
Which of the following are examples of genomic imprinting?
1. Angelman syndrome
2. Williams syndrome
3. Prader-Willi syndrome
4. DiGeorge syndrome
Select the correct answer using the code given below:
- A tall thin adolescent boy is found to have gynaecomastia and small testes. His blood testosterone level is undetectable, and serum FSH and LH levels are elevated. Which one of the following is the likely karyotype pattern?
