OBJECTIVE: To explore the long-term outcome of patients who began IVF treatment by considering not only treatment outcome in the center but also the parenthood project outcome after discontinuation of unsuccessful IVF. DESIGN: Retrospective cohort follow-up study. SETTING: Two French IVF centers. PATIENT(S): Seven hundred twenty-four patients who began IVF treatment in 1998. INTERVENTION(S): Postal and phone contacts with unsuccessful IVF patients. MAIN OUTCOME MEASURE(S): Long-term outcome of parenthood project. RESULT(S): Of the 724 patients, a minimum of 53% and a maximum of 81% finally succeeded in their parenthood project during or after IVF treatment (depending on the hypotheses that the 204 patients not contacted either failed or...