Serum levels of LH, IGF-1 and leptin in girls with idiopathic central precocious puberty (ICPP) and the correlations with the development of ICPP.

BACKGROUND: This paper aims to investigate the correlation between serum levels of luteinizing hormone (LH), insulin-like growth factor-1 (IGF-1) and leptin and the incidence of idiopathic central precocious puberty (ICPP) in girls, and to explore the clinical values in the diagnosis of ICPP.

METHODS: A total of 48 girls with ICPP were selected in our hospital from March 2014 to March 2015 to serve as ICPP group. At the same time, 48 girls with the same age distribution were selected as control group. Bone age, body weight, body mass index (BMI) and gender development index of girls in each group were recorded. Levels of LH, IGF-1 and leptin in serum were measured by chemiluminescence immunoassay. The correlations within levels of LH, IGF-1 and leptin, and the correlations between levels of LH, IGF-1 and leptin and body height, body weight and gender development index were analyzed.

RESULTS: Levels of LH, IGF-1 and leptin in ICPP group were significantly higher than those in control group (p<0.01). Body weight and BMI of ICPP group were significantly higher than those of control group (p<0.01), and were positively correlated with the expression level of leptin; ovarian volume and thickness of breast of ICPP group were significantly higher than those of control group (p<0.01), and were positively correlated with serum level of LH; serum level of IGF-1 was positively correlated with bone age. Levels of LH, IGF-1 and leptin in serum of ICPP girls were all increased compared with control group.

CONCLUSIONS: LH peak value and levels of IGF-1 and leptin in serum can be used as diagnostic indexes of ICPP.