The main cause of IVF treatment failure or a miscarriage is often embryo-related. Should couples suffer from recurrent miscarriages or recurrent implantation failure, further investigations should be proceeded to minimise any burden on the individuals. It can also help certify if there are any potentially treatable causes. In the situation where individuals suffer from recurrent implantation failure, the best time to get tested depends on a variety of elements which include: age; number of failed cycles; and embryo quality.