Which supplement is commonly recommended during pregnancy to prevent neural tube defects?

NCL (Northern Coalfields Limited)-NO

Applied Nutrition & Dietetics

Easy

Appeared in: NCL (Northern Coalfields Limited)-NO

Explanation

Folic acid is a B-vitamin (B9) that is essential for DNA synthesis and cell division.
During the first few weeks of pregnancy, folic acid plays a critical role in the development and closure of the neural tube, which becomes the baby's brain and spinal cord.
Insufficient folic acid levels during this periconceptional period can lead to severe birth defects known as neural tube defects (NTDs), such as spina bifida and anencephaly.
Supplementation with at least 400-600 mcg of folic acid daily before and during early pregnancy is a proven public health measure that has significantly reduced the incidence of NTDs.

Option A: Vitamin D is a fat-soluble vitamin crucial for calcium absorption and bone metabolism. Its deficiency can affect maternal and fetal bone health but it is not directly involved in the closure of the neural tube.
Option B: Calcium is a mineral that is the primary building block for the fetal skeleton, teeth, heart, nerves, and muscles. It does not play a direct role in the biochemical pathways of neural tube formation.
Option D: Iron is a mineral essential for the formation of hemoglobin, the protein in red blood cells that carries oxygen. Its role is to prevent maternal anemia and support the expansion of blood volume, not to prevent neural tube defects.

Visual 1: Infographic - A timeline showing the first 28 days of embryonic development, highlighting the closure of the neural tube and illustrating how folic acid deficiency can lead to spina bifida or anencephaly.
Visual 2: Diagram - A simple diagram comparing a healthy closed neural tube to an open neural tube in spina bifida, with a text box explaining folic acid's role.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Prenatal nutrition and prevention of neural tube defects as background academic context rather than a clinical decision trigger.
A key nursing responsibility is preconception counseling, which includes educating all women of childbearing potential about the importance of daily folic acid intake, as many pregnancies are unplanned.
The critical window for NTD prevention is very early, often before pregnancy is confirmed. Therefore, supplementation should begin at least one month before conception and continue through the first trimester.
What if? If a patient has a history of a previous pregnancy affected by a neural tube defect, the recommended dose of folic acid is significantly higher (typically 4 mg or 4,000 mcg per day) to reduce the recurrence risk.

How to Approach the Question

This is a factual recall question common in nursing exams.
Identify the core concept: prevention of a specific birth defect.
The keywords are "pregnancy" and "neural tube defects."
Recall the specific micronutrient directly linked to the prevention of neural tube defects.
Evaluate the options: Vitamin D and Calcium are related to bone health, and Iron is for preventing anemia. Folic acid is specifically known for its role in neural development.
Select the option that directly addresses the prevention of neural tube defects.

Concept Tested & Keywords

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