- Infertility is generally defined as one year of unprotected intercourse without conception.
- Approximately 85–90% of healthy young couples conceive within 1 year, most within 6 months. Infertility therefore affects approximately 10–15% of couples and is an important part of the practice of many clinicians.
- Cycle fecundability is the probability that a cycle will result in pregnancy and fecundity is the probability that a cycle will result in a live birth.
ART techniques have provided the means to study reproductive processes in new and more revealing ways and have markedly improved the prognosis for a great many infertile couples, particularly those whose infertility relates to severe tubal damage or male factors.