護理師為 30 歲女性提供生殖健康諮詢。關於葉酸攝取，哪項資訊對健康維護最為關鍵？
A nurse is counseling a 30-year-old female client about reproductive health. Which information regarding folic acid intake is most critical for health maintenance?
- AConsume at least 400 mcg daily to prevent neural tube defects✓ 正解每日攝取至少 400 mcg 以預防神經管缺陷
- BReplace folic acid with iron supplements for better results以鐵劑補充品取代葉酸以獲得較佳效果
- CBegin intake only after confirming a positive pregnancy test僅在確認驗孕陽性後開始攝取
- DIncrease intake only if a family history of congenital disorders exists僅在有先天性障礙家族史時增加攝取量
葉酸（Folic acid）對於胚胎神經管發育至關重要，神經管閉合發生在受孕後的最初幾週，此時女性往往尚未意識到自己懷孕。因此，育齡婦女應在備孕期即每日補充至少 400 微克葉酸，以預防脊柱裂等神經管缺陷。等待懷孕確認後才補充通常已錯過預防黃金期。此類衛教屬於初級預防（Primary prevention），對降低先天缺陷發生率意義重大。
Folic acid is critical for the development of the embryonic neural tube; neural tube closure occurs in the first few weeks after conception, often before a woman is aware that she is pregnant. Therefore, women of childbearing age should take at least 400 mcg of folic acid daily during the preconception period to prevent neural tube defects such as spina bifida. Waiting until pregnancy is confirmed before starting supplementation often misses the critical window for prevention. This teaching is part of primary prevention and is highly meaningful for reducing the incidence of congenital defects.