When a pregnant woman has a fetal arrest or recurrent miscarriage, it is recommended that the abortion product be sent for genetic testing for chromosome acquisition, called aneuploidy testing, or CNV aneuploidy testing. More than half of the causes of miscarriage or recurrent miscarriage are related to congenital abnormalities of the fetus, i.e., chromosomal abnormalities. Therefore, it is essential to send the abortion product for chromosome testing or genetic testing. Because the purpose of pregnancy is to have a healthy next generation, when miscarriage or recurrent miscarriage occurs, more than half of the causes are related to chromosomal or genetic abnormalities, and if chromosomal aneuploidy testing is performed, it is helpful to confirm the cause of miscarriage and to clarify the cause of recurrent miscarriage. The identification of these causes is very important for the next normal pregnancy.