Aim: To determine the sensitivity, specificity of basal LH measurement compared to the GnRH test in patients with Central precocious puberty (CPP) and determine the cut off point for basal LH to diagnose CPP. Methods: 680 female patients were referred for presumptive diagnosis of central precocious puberty in the city of Bogota. All patients went through a GnRH test, using a Roche immunoassay for Luteinizing hormone (LH) and follicle stimulating hormone (FSH). The stimulus used was triptorelin pamoate measured at 0, 30
