Infant gonadotropins predict spontaneous puberty in girls with Turner syndrome.

OBJECTIVES

Hypergonadotropic hypogonadism is a characteristic clinical manifestation of Turner syndrome (TS). While up to 30 and 20 % of people with TS will have spontaneous thelarche and menarche respectively, there is a lack of evidence to predict who will retain sufficient ovarian function to achieve these outcomes. The aim of this study was to determine if follicle-stimulation hormone (FSH) and/or luteinizing hormone (LH) concentrations measured in infancy would accurately predict later spontaneous thelarche or menarche.

METHODS

Patients with a diagnosis of Turner syndrome with FSH and/or LH clinically measured prior to three years of age and now ≥10 years of age with documented pubertal assessment were included (n=33). Differences in infant gonadotropin values were determined for patients with vs. without spontaneous thelarche/menarche using Kruskal-Wallis tests. The optimal threshold of infant LH and FSH to predict spontaneous thelarche and menarche was then determined by maximizing the sum of sensitivity and specificity.

RESULTS

The prevalence of spontaneous thelarche and menarche were 21.2 and 15.2 % respectively. An infant LH value greater than 0.5 mIU/mL predicted lack of spontaneous thelarche with an estimated accuracy of 94 % and lack of spontaneous menarche with an estimated accuracy of 96 %. An infant FSH value greater than 37.4 mIU/mL predicted lack of lack of spontaneous thelarche with an accuracy of 97 % and lack of spontaneous menarche with an accuracy of 100 %.

CONCLUSIONS

Infant gonadotropin concentrations accurately predict spontaneous later thelarche and menarche for persons with TS.