Recent studies reveal that as many as 15 percent of couples in the U.S. are considered infertile - that is, they are unable to conceive a child after one year of unprotected intercourse. While infertility may have complicated, sometimes multiple physical causes, it can also exact an emotional toll. Couples having difficulty conceiving a child can look to the Stanford Fertility and Reproductive Medicine Center for one of the nation's most comprehensive and progressive treatment programs.