A Systematic Review and Meta-Analysis of Vitamin D Status and Clinical Outcomes in Critically Ill Neonates

Why It Matters

These findings suggest that correcting vitamin D deficiency could reduce infection rates and resource utilization in neonatal intensive care, offering a potentially low‑cost strategy to improve outcomes. However, without robust RCT evidence, clinicians cannot yet implement routine supplementation protocols.

Key Takeaways

• VDD raises sepsis odds by 2.3× in NICU infants
• Deficient neonates stay ~4.5 days longer in hospital
• Mechanical ventilation need increases 1.7‑fold with VDD
• No mortality or BPD difference linked to vitamin D status
• Heterogeneous VDD definitions limit causality; large RCTs required

Pulse Analysis

Vitamin D deficiency remains a pervasive public‑health issue, affecting roughly one‑billion people worldwide, and neonates are among the most vulnerable groups. In the NICU, deficiency rates exceed 90 % in many preterm cohorts, driven by limited trans‑placental transfer, exclusive breastfeeding without supplementation, and minimal sunlight exposure. Beyond its classic role in calcium metabolism, vitamin D modulates innate immunity by inducing antimicrobial peptides and tempering inflammatory pathways, mechanisms that are especially critical for infants battling severe infections and respiratory compromise.

5 hospital days, while also increasing the likelihood of mechanical ventilation by 70 %. These associations persisted across both preterm and term infants, yet mortality and bronchopulmonary dysplasia showed no significant link. Compared with adult ICU literature, where low vitamin D often predicts higher death rates, the neonatal findings underscore a distinct pathophysiologic profile but are tempered by considerable heterogeneity in deficiency thresholds and study designs.

Given the modest cost and safety profile of enteral vitamin D, early supplementation emerges as an attractive strategy to curb sepsis and shorten NICU stays, but definitive evidence is lacking. Ongoing trials in preterm infants suggest that daily doses of 800 IU can normalize serum levels within two weeks, while high‑dose bolus regimens have shown promise in pediatric sepsis trials. To translate these signals into practice, large‑scale, multicenter randomized studies must standardize deficiency cut‑offs, evaluate optimal dosing schedules, and assess long‑term neurodevelopmental outcomes, thereby determining whether routine vitamin D correction can become a standard of care in neonatal intensive care.