We report pediatric reference intervals for FSH, LH, E2, T3, FT3, cortisol, and GH. .. 1–2 years in girls and increase at the onset of puberty and the development. Oticon Opn™ hearing aids for teens. Oticon Opn is our best of possibilities. Not a teen? Check out our Opn solutions page for all ages.. ped-b2c-imagespot3.