Memo to pediatricians: Screen all kids for vitamin D deficiency, test those at high risk

"Vitamin D deficiency can be a problem year round, but because sun exposure is critical for vitamin D synthesis and production, the winter months further exacerbate what is a perennial problem," says Johns Hopkins Children's Center endocrinologist Dominique Long, M.D. Levels at or below 20 nanograms per milliliter are considered suboptimal.

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