LCS12 Adolescent Study

Inclusion Criteria: * The subject has signed and dated the informed consent form (ICF) * The subject is female, generally healthy, post-menarcheal, nulliparous or parous, requiring contraception, and is under 18 years of age at the Screening visit * The subject has regular menstrual cycles without hormonal contraceptive use (at regular intervals of 21-35 days) * In the opinion of the investigator, the subject has general and uterine conditions suitable for the insertion of levonorgestrel intrauterine contraceptive system (LCS12) (uterine sound depth 6-10 cm) * Has clinically normal safety laboratory results * The subject has a normal or clinically insignificant cervical smear (i.e. one that does not require further follow up according to Bethesda or a comparable system) * The subject is willing and able to attend the scheduled study visits and to comply with the study procedures Exclusion Criteria: * Known or suspected pregnancy or is lactating * Vaginal delivery, cesarean delivery, or abortion less than 6 weeks before Visit 1 * History of ectopic pregnancies * Infected abortion or postpartum endometritis less than 3 months before Visit 1 * Abnormal uterine bleeding of unknown origin * Any lower genital tract infection (until successfully treated) * Acute or history of recurrent pelvic inflammatory disease * Congenital or acquired uterine anomaly