An abortion is the removal or expulsion of an embryo or fetus from the uterus, resulting in or cause by its death. The spontaneous expulsion of a fetus or embryo before the 20th week of gestational age is commonly known as a miscarriage. Induced abortion is the removal or expulsion of an embryo or fetus by medical, surgical, or other means at any point during human pregnancy for therapeutic or elective reasons. The approximate number of induced abortions performed worldwide in 2003 was 42 million.