OBJECTIVE: We assessed the utility of spontaneous and gonadotropin-releasing hormone (GnRH)-stimulated serum luteinizing hormone (LH) and follicle-stimulating hormone (FSH) levels measured by new immunochemiluminometric assays in the evaluation and monitoring of precocious puberty. METHODS: We evaluated serum gonadotropin values from intravenous GnRH stimulation tests in 49 girls with clinical signs suggesting central precocious puberty (CPP). Because GnRH-stimulated LH has been considered the standard for diagnosing CPP, we used it as the basis for comparison with GnRH-stimulated FSH levels and spontaneous LH and FSH measured by immunochemiluminometric assay. RESULTS: Twenty-six patients had a peak serum LH value above the +2 SD threshold for normal prepubertal female subjects (LH > 5 IU/L). The GnRH-stimulated FSH values had a narrow range and did not discriminate patients with CPP. In contrast, elevations in spontaneous LH and FSH were found to be specific for CPP. Spontaneous LH levels correlated strongly with peak stimulated LH levels in subjects with precocious puberty (r = 0.79) or in control subjects (r = 0.93, both p (0.0001). Spontaneous LH levels in excess of 0.1 IU/L detected true puberty with 94% sensitivity and 88% specificity. Random LH levels in excess of 0.3 IU/L had 100% specificity for CPP. CONCLUSIONS: The GnRH-stimulated FSH levels do not adequately differentiate children with and without CPP and have limited utility in the evaluation of precocious puberty. Spontaneous FSH levels are elevated in CPP with fair sensitivity and marked specificity. Elevated random LH, measured by third-generation assay such as immunochemiluminometric assay, is strongly correlated with and highly predictive of elevated peak GnRH-stimulated LH, and is a useful screening tool for CPP.
OBJECTIVE: We assessed the utility of spontaneous and gonadotropin-releasing hormone (GnRH)-stimulated serum luteinizing hormone (LH) and follicle-stimulating hormone (FSH) levels measured by new immunochemiluminometric assays in the evaluation and monitoring of precocious puberty. METHODS: We evaluated serum gonadotropin values from intravenous GnRH stimulation tests in 49 girls with clinical signs suggesting central precocious puberty (CPP). Because GnRH-stimulated LH has been considered the standard for diagnosing CPP, we used it as the basis for comparison with GnRH-stimulated FSH levels and spontaneous LH and FSH measured by immunochemiluminometric assay. RESULTS: Twenty-six patients had a peak serum LH value above the +2 SD threshold for normal prepubertal female subjects (LH > 5 IU/L). The GnRH-stimulated FSH values had a narrow range and did not discriminate patients with CPP. In contrast, elevations in spontaneous LH and FSH were found to be specific for CPP. Spontaneous LH levels correlated strongly with peak stimulated LH levels in subjects with precocious puberty (r = 0.79) or in control subjects (r = 0.93, both p (0.0001). Spontaneous LH levels in excess of 0.1 IU/L detected true puberty with 94% sensitivity and 88% specificity. Random LH levels in excess of 0.3 IU/L had 100% specificity for CPP. CONCLUSIONS: The GnRH-stimulated FSH levels do not adequately differentiate children with and without CPP and have limited utility in the evaluation of precocious puberty. Spontaneous FSH levels are elevated in CPP with fair sensitivity and marked specificity. Elevated random LH, measured by third-generation assay such as immunochemiluminometric assay, is strongly correlated with and highly predictive of elevated peak GnRH-stimulated LH, and is a useful screening tool for CPP.
Authors: Louise Fugl; Casper P Hagen; Mikkel G Mieritz; Jeanette Tinggaard; Eva Fallentin; Katharina M Main; Anders Juul Journal: Pediatr Res Date: 2016-06-03 Impact factor: 3.756
Authors: Angela Delaney; Rita Volochayev; Brooke Meader; Janice Lee; Konstantinia Almpani; Germaine Y Noukelak; Jennifer Henkind; Laura Chalmers; Jennifer R Law; Kathleen A Williamson; Christina M Jacobsen; Tatiana Pineda Buitrago; Orlando Perez; Chie-Hee Cho; Angela Kaindl; Anita Rauch; Katharina Steindl; Jose Elias Garcia; Bianca E Russell; Rameshwar Prasad; Uttam K Mondal; Hallvard M Reigstad; Scott Clements; Susan Kim; Kaoru Inoue; Gazal Arora; Kathryn B Salnikov; Nicole P DiOrio; Rolando Prada; Yline Capri; Kosuke Morioka; Michiyo Mizota; Roseli M Zechi-Ceide; Nancy M Kokitsu-Nakata; Cristiano Tonello; Siulan Vendramini-Pittoli; Gisele da Silva Dalben; Ravikumar Balasubramanian; Andrew A Dwyer; Stephanie B Seminara; William F Crowley; Lacey Plummer; Janet E Hall; John M Graham; Angela E Lin; Natalie D Shaw Journal: J Clin Endocrinol Metab Date: 2020-05-01 Impact factor: 5.958