Vitamin D deficiency has been associated with several pathologies in humans and has recently been linked to idiopathic central precocious puberty in girls. We evaluated this potential link in a retrospective study. Among 493 girls with idiopathic central precocious puberty previously described, we selected 145 girls for whom a plasma sample at the initial evaluation was available to determine the concentration of 25OHD and 1,25(OH)2D. We analyzed the correlation between different puberty characteristics (BMI, growth rate the year before the onset of puberty, bone age, LH and FSH peaks, LH/FSH peak ratio, and estradiol concentration) and the concentration of 25OHD and 1,25(OH)2D. The mean 25OHD serum concentration was 27.6±17.3 ng/mL. Eleven percent of the patients had a severe vitamin D deficiency, 18.6% had a moderate deficiency, 39.4% had an optimal vitamin D status, and 31% had a 25OHD concentration above 30 ng/mL. Season was the only factor that appeared to influence the 25OHD concentration. No correlation was found between 25OHD serum concentration and different puberty characteristics.
Conclusion: Overall, our patients had a satisfactory vitamin D status. We did not find any correlation between vitamin D status and the characteristics of central precocious puberty. Further studies are required to confirm this hypothesis. What is known: • Vitamin D status seems to affect gonadal hormones and fertility. • Vitamin D deficiency may contribute to earlier puberty and was associated with earlier menarche. What is new: • 25OHD of 145 girls with precocious puberty was similar to or higher than that of healthy French children or adolescents. • We did not find any correlation between vitamin D status and puberty characteristics.
Keywords: 1,25(OH)2D; 1,25-dihydroxyvitamin D; 25OHD; Central precocious puberty; Vitamin D.