Predictive value of transabdominal pelvic ultrasonography for the diagnosis of central precocious puberty: a single-center observational retrospective study

: This single-center, observational, retrospective study aimed to evaluate the diagnostic accuracy of pelvic ultrasonographic parameters for detecting central precocious puberty (CPP) in a cohort of female pediatric patients undergoing gonadotropin stimulation tests. The study population consisted of 47 female patients with a suspicion of CPP. Thirty four out of 47 patients (72.34%) were subsequently diagnosed with CPP based on the current laboratory diagnostic criteria (LH peak > 5 IU/L). The ultrasonography results of 39 out of 47 patients (82.97%) were categorized as pubertal, while 31 out of 34 participants (91.17%) in the CPP group exhibited pubertal ultrasonography features. In 13 out of 47 girls (27.65%), a CPP diagnosis was ruled out; however, among these 13 patients, eight exhibited pubertal ultrasonography features suspicious of CPP. We observed a robust concordance between the GnRH test results indicative of pubertal activation and the presence of pubertal pelvic ultrasonographic features in 31 out of 34 children (91.17%). A significant correlation was found between ovarian volume and basal LH and LH/ FSH ratio, and also for basal LH, LH peak, LH/FSH ratio and peak LH/FSH ratio (p = 0.026, p = 0.011, p = 0.031, p = 0.004, respectively). Pelvic ultrasonography had a sensitivity of 91.17% and a specificity of 38.46% in differentiating CPP from premature thelarche.