Susan and Tom, respectively 24 and 32 years old, haven’t managed to have a baby, despite trying a lot for 2 years. Susan is an accountant and Tom is a computer scientist. Susan has already got a child from a previous wedding. They decide to see a doctor to understand and correct this infertility problem. You are the specialist and you propose the couple start fertility treatment. We need to understand the origin of their sterility problem in order to find the right treatment.