Use of IUD and subsequent fertility--follow-up after participation in a randomized clinical trial.

Purpose: Although the IUD has been a contraceptive method for about 50 years, how it affects subsequent fertility remains controversial. The aim of our study was to examine time to pregnancy, pregnancy outcome and the need for infertility workup in a cohort of previous copper IUD users.

Materials And Methods: From May 1993 to April 1995, 957 women were included in a prospective cohort IUD study in the city of Trondheim, Norway.