Secondary Infertility is defined as the inability to become pregnant, or to carry a pregnancy to term, following the birth of one or more biological children.

The World Health Organisation defines Infertility as “a disease of the reproductive system defined by the failure to achieve a clinical pregnancy after 12 months or more of regular unprotected sexual intercourse.”  This being Primary Infertility.   The WHO also adds that Primary Infertility includes ‘women whose pregnancy spontaneously miscarries, or whose pregnancy results in a still born child, without ever having had a live birth.”

WHO defines Secondary Infertility as “when a woman is unable to bear a child, either due to the inability to become pregnant or the inability to carry a pregnancy to a live birth following either a previous pregnancy or a previous ability to carry a pregnancy to a live birth”

Thus the distinguishing feature is whether or not the couple have ever had a pregnancy which led to a live birth.