Phosphate Concentrations and Modifying Factors in Healthy Children From 12 to 24 Months of Age

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Abstract
Context Phosphate homeostasis and its modifiers in early childhood are inadequately characterized. Objective To determine physiological plasma phosphate concentration and modifying factors in healthy infants at 12 to 24 months of age. Design This study included 525 healthy infants (53% girls), who participated in a randomized vitamin D intervention trial and received daily vitamin D3 supplementation of either 10 or 30 μg from age 2 weeks to 24 months. Biochemical parameters were measured at 12 and 24 months. Dietary phosphate intake was determined at 12 months. Main Outcome Measures Plasma phosphate concentrations at 12 and 24 months of age. Results Mean (SD) phosphate concentration decreased from 12 months (1.9 ± 0.15 mmol/L) to 24 months (1.6 ± 0.17 mmol/L) of age (P < 0.001 for repeated measurements). When adjusted by covariates, such as body size, creatinine, serum 25-hydroxyvitamin D, intact and C-terminal fibroblast growth factor 23, mean plasma phosphate was higher in boys than girls during follow-up (P = 0.019). Phosphate concentrations were similar in the vitamin D intervention groups (P > 0.472 for all). Plasma iron was associated positively with plasma phosphate at both time points (B, 0.006 and 0.005; 95% CI, 0.004-0.009 and 0.002-0.008; P < 0.001 at both time points, respectively). At 24 months of age, the main modifier of phosphate concentration was plasma creatinine (B, 0.007; 95% CI 0.003-0.011, P < 0.001). Conclusion Plasma phosphate concentration decreased from age 12 to 24 months. In infants and toddlers, the strongest plasma phosphate modifiers were sex, iron, and creatinine, whereas vitamin D supplementation did not modify phosphate concentrations.
Funding Information
  • the Sigrid Jusélius Foundation
  • Research Council of Finland
  • Swedish Research Council
  • Novo Nordisk Foundation
  • Folkhälsan Research Foundation
  • Finnish Medical Foundation
  • Victoriastiftelsen
  • Orion Research Foundation
  • Instrumentarium Science Foundation
  • Paulo Foundation
  • Paivikki and Sakari Sohlberg Foundation
  • Juho Vainio Foundation
  • Finnish Pediatric Research Foundation
  • Finska Läkaresällskapet
  • Stiftelsen Dorothea Olivia
  • Karl Walter och Jarl Walter Perkléns minne

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