If a mother previously delivered a child with neural tube defect, to prevent neural tube defect in the second child, the mother should take ______ folic acid per day.

Appeared in: RRB Nsg. Superintendent - 29 April 2025 (Shift-3rd)

Explanation

Women who have had a previous pregnancy affected by a neural tube defect (NTD) are considered to be at high risk for recurrence.
For this high-risk group, the recommended prophylactic dose of folic acid is 4 mg (4000 mcg) per day.
This high-dose supplementation should ideally begin at least one month before conception and continue through the first trimester of pregnancy, the critical period for neural tube closure.
This regimen has been shown to reduce the risk of an NTD in a subsequent pregnancy by about 70%.

Option B: This dose (600 mcg) is the general recommended daily allowance for pregnant women to support overall fetal growth, but it is insufficient for the prevention of NTD recurrence in a high-risk patient.
Option C: A 2 mg dose is not a standard evidence-based recommendation for either low-risk or high-risk NTD prevention.
Option D: This is the standard prophylactic dose for women of childbearing age who are at average or low risk for having a child with an NTD. It is not sufficient for a high-risk woman.

Visual 1: Infographic: A visual chart comparing the recommended folic acid dosages for low-risk versus high-risk pregnancies, highlighting the 10-fold difference (0.4 mg vs. 4 mg).
Visual 2: Food Chart: A list of foods rich in natural folate (e.g., leafy green vegetables, legumes, citrus fruits) and fortified foods (e.g., cereals, bread) to supplement intake.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Folic acid supplementation for the prevention of neural tube defects (NTDs) in high-risk pregnancies as background academic context rather than a clinical decision trigger.
A nurse's role in preconception counseling is vital for identifying high-risk women based on their obstetric and family history.
Patient education must emphasize that supplementation needs to start before conception, as the neural tube closes by the 28th day after conception, often before a woman knows she is pregnant.
What if? If the woman had no history of NTD but was taking certain anti-epileptic drugs like valproic acid or carbamazepine, she would also be considered high-risk and require a higher dose of folic acid (typically 1-5 mg daily) as these medications can interfere with folate metabolism.

How to Approach the Question

First, carefully read the clinical scenario presented in the question stem. Identify the key patient characteristic: 'a mother previously delivered a child with neural tube defect'.
Recognize that this history automatically places the patient in a 'high-risk' category for a recurrence.
Recall the standard folic acid supplementation guidelines for both low-risk and high-risk pregnancies.
Differentiate between the low-risk dose (0.4 mg or 400 mcg) for the general population and the high-risk dose (4 mg or 4000 mcg) for women with a prior NTD-affected pregnancy.
Evaluate the options provided and select the one that corresponds to the high-risk recommendation.
Eliminate the other options by identifying them as the low-risk dose (0.4 mg), a general pregnancy RDA (0.6 mg), or a non-standard dose (2 mg).

Concept Tested & Keywords

Concept Tested: Folic acid supplementation for the prevention of neural tube defects (NTDs) in high-risk pregnancies.
Stem keywords: neural tube defect, folic acid, prevent, second child, previously delivered
Lead-in keywords: BEST, MOST RELEVANT CLUE
Clinical cues: The patient's history of a previous child with a neural tube defect is the critical piece of information that classifies her as high-risk.
Negative lead-in flag: false

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