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)