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Vitamin d dose in a child of 3 years

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"vitamin D" AND supplementation AND children AND dose

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Here is a complete, evidence-based breakdown of vitamin D dosing for a 3-year-old child:

Vitamin D Dosing in a 3-Year-Old Child

1. Dietary Supplementation (Maintenance / Prevention)

IndicationDose
Child aged ≥1 year (healthy, adequate diet)400-600 IU/day orally
  • The IOM (Institute of Medicine) RDA for children >1 year up to age 50 is 600 IU/day
  • The Harriet Lane Handbook (23rd ed.) recommends 400-600 IU/24 hr PO for children ≥1 year and adolescents

2. Treatment of Vitamin D Insufficiency / Deficiency (No Malabsorption)

A 3-year-old falls in the "≥1 yr" age bracket:
25-OH Vitamin D LevelDose
12-<20 ng/mL (Insufficiency)2,000 IU once daily
<12 ng/mL (Deficiency)5,000-6,000 IU once daily OR 50,000 IU once weekly
(Harriet Lane Handbook, 23rd ed., p. 1077)

3. Treatment in Children with Malabsorptive Conditions (e.g., short bowel, cholestatic liver disease)

For children <10 years (which includes a 3-year-old):
25-OH Vitamin D LevelDose
12-<20 ng/mL (Insufficiency)2,000 IU once daily
<12 ng/mL (Deficiency)5,000 IU once daily

4. Special Conditions

  • Cystic fibrosis: Use disease-specific multivitamin products (DEKA Plus, MVW Complete, ADEK) - doses are higher and age-stratified
  • CKD (stages 2-5): Use calcitriol (activated vitamin D) with close monitoring of calcium, phosphorus, and 25-OH vitamin D levels (goal ≥20 ng/mL)
  • Hypoparathyroidism (>1 yr): Start calcitriol at 0.25 mcg/day PO, titrate every 2-4 weeks

5. Key Monitoring Points

  • Recheck serum 25-OH vitamin D 3 months after initiating or changing dose
  • Target serum level for children: ≥20 ng/mL
  • Also monitor serum calcium and alkaline phosphatase during treatment

Summary Table

PurposeDose
Daily maintenance (healthy child)400-600 IU/day
Insufficiency treatment2,000 IU/day
Deficiency treatment5,000-6,000 IU/day or 50,000 IU/week
All doses are oral cholecalciferol (vitamin D3). 1,000 IU = 25 mcg.
Sources: Harriet Lane Handbook 23rd ed., p. 1077; Rheumatology 2-Volume Set (Elsevier, 2022); IOM recommendations
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