Background: Gonadotropin and steroid concentrations obtained in various laboratories cannot often be compared because of methodological differences.
Aims: to determine reference intervals for FSH, LH, T, E2, F and DHEA-S according to age and sex during the first year of life.
Methods: 1236 healthy infants (1-365 days of age) were recruited at Hospital de Niños in Córdoba, Argentina.