For infertility, it is important to conduct relevant tests as early as possible while young, to receive effective treatment promptly, and to complete childbirth at the earliest. Firstly, male testing should be conducted because the probability of male infertility is also high, and the tests for males are relatively simpler. Afterwards, the causes in females should be investigated, such as monitoring ovulation and conducting endocrine tests for ovulation. Then, the condition of the endometrium should be examined, and a hysterosalpingography should be performed between the third and seventh days of a clean menstrual period to see if this factor contributes to infertility. Subsequently, various biochemical tests, such as immune function and pre-thrombotic state, should also be considered.