Infertility is defined by the World Health Organization as the inability to conceive after more than 1 year of unprotected intercourse. Worldwide 10 -14 % of couples in the reproductive age group face difficulty in conceiving. However, with rapid advancement in medical technology, at least 90% infertile cases are treatable today.
Fertilisation takes place when a live sperm from the male successfully fuses with the newly released mature egg of the female and the process of cell division starts. The embryo then travels down the fallopian tube and implants itself in the uterus wall where it grows into a baby. Thus results pregnancy.
Infertility may be due to a problem in the male or the female or in both partners. In some rare cases the cause of infertility cannot be diagnosed to either of the spouses. This is known as unexplained infertility.