Unexplained infertility is a diagnosis of exclusion. This means that all other causes have been ruled out. Many times a presumptive diagnosis of unexplained infertility is given when the evaluation is not completed due to a low likelihood that further testing will find an abnormality. Unexplained infertility can be very frustrating because people want answers, but fortunately, treatment options offer significant improvements in couples with unexplained infertility. For more information view Unexplained Infertility.