Research Article
Opinions and Practice of US-Based Obstetrician-Gynecologists regarding Vitamin D Screening and Supplementation of Pregnant Women
Table 4
Institute of Medicine and the Endocrine Society recommendations for vitamin D during pregnancy.
| | Recommended daily allowance (RDA) | Daily requirement | Tolerable daily upper intake level | Minimal serum 25-hydroxyvitamin D level |
| Institute of Medicine | | | | | 14–18 yr | 600 IU | | 4,000 IU | 20 ng/mL (50 nmol/L) | 30–50 yr | 600 IU | | 4,000 IU | 20 ng/mL (50 nmol/L) |
| Endocrine Society | | | | | 14–18 yr | | 600–1,000 IU | 4,000 IU | 30 ng/mL (75 nmol/L) | 30–50 yr | | 1,500–2,000 IU | 10,000 IU | 30 ng/mL (75 nmol/L) |
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