How much vitamin D should I take?

[摘要]：Clinical vignette: A 68-year-old woman consults you after a recent bone mineral density screening revealed osteopenia, total hip T score of-1.8. Further evaluation shows her only other abnormal lab value is a serum 25-hydroxy-vitamin D [25(OH)D] level of 13 ng/ml (normal 30-80). You find no evidence of malabsorption. What vitamin D supplement regimen should you recommend to reduce her risk of fractures?

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