Plasma 1.25-dihydroxyvitamin D concentrations in preterm infants

Area of Science:

• Pediatrics
• Endocrinology
• Nutritional Science

Background:

• Preterm infants face unique nutritional challenges.
• Vitamin D metabolism is critical for bone health in infants.
• Understanding vitamin D metabolite levels in preterm infants is essential.

Purpose of the Study:

• To measure 1.25-dihydroxyvitamin D concentrations in preterm infants.
• To compare these levels with those in adults.
• To assess potential correlations with clinical and biochemical parameters.

Main Methods:

• Measured 1.25-dihydroxyvitamin D in 10 preterm infants over 12 weeks.
• Monitored nutritional intake (parenteral and enteral feeding, vitamin D3 supplementation).
• Assessed clinical, chemical, and radiological signs of rickets.

Main Results:

• 1.25-dihydroxyvitamin D levels were highly variable but generally high in preterm infants.
• Mean levels at 6, 9, and 12 weeks were significantly higher than in adults.
• No correlation found between 1.25-dihydroxyvitamin D and 25-hydroxyvitamin D, calcium, phosphorus, or alkaline phosphatase.

Conclusions:

• Preterm infants demonstrate a capacity for producing elevated plasma 1.25-dihydroxyvitamin D.
• High levels were observed despite standard vitamin D supplementation and without rickets.
• Further research may explore the implications of these findings for preterm infant health.