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Table 1 Recommended limits for vitamin D serum concentrations (25-OH vitamin D) [3]

From: Vitamin D supplementation after the second year of life: joint position of the Committee on Nutrition, German Society for Pediatric and Adolescent Medicine (DGKJ e.V.), and the German Society for Pediatric Endocrinology and Diabetology (DGKED e.V.)

• > 100 ng/mL (> 250 nmol/L): intoxication
• 20–100 ng/mL (50–250 nmol/L): target area
• 12–20 ng/mL (30–50 nmol/L): subnormal
• < 12 ng/mL (< 30 nmol/L): deficiency