According the About.com Contraception, the median time to planned pregnancy after removing a copper TCu 380 Ag IUD is three months. The average couple conceives after six months, so this represents an almost instant return of fertility.
The copper used in these IUDs works as a natural spermicide. Once the IUD is removed, fertility is restored quickly because there is no longer copper present to prevent fertilization. The quick reversal of its contraceptive action is one of the copper IUD's key advantages. A copper IUD must be removed by a qualified medical professional. Depending on the model, copper IUDs are generally effective for five to 10 years.