age range for premenarchal
The mean ovarian volume in girls less than 6 years of age is less than or equal to 1 cm3. The increase in ovarian volume begins after 6 years of age (Table). In prepubertal girls (6â10 years old), ovarian volumes range from 1.2 to 2.3 cm3. In premenarchal girls (11â12 years old), ovarian volumes range from 2 to 4 cm3. In postmenarchal girls, the ovarian volume averages 8 cm3 (range, 2.5â20 cm3).