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备孕及孕早期女性预防神经管缺陷选0.4mg/天规格，我国增补叶酸项目及膳食指南推荐剂量为0.4mg，无需追求更高剂量

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Partially Verified备孕及孕早期（怀孕前3个月至孕后3个月）每日推荐补充0.4mg（400μg）叶酸以预防胎儿神经管缺陷；曾生育过神经管缺陷儿或高危人群需在医生指导下增至4mg/天91% similar Unverified0.4mg剂量适用于无叶酸缺乏高危因素的普通备孕及孕早期女性；有神经管缺陷生育史或服用抗癫痫药物等高危人群通常需遵医嘱补充更高剂量87% similar

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