Pregnancy testing for Down’s syndrome is the Down’s syndrome screening test that is done during pregnancy when you have a pregnancy test. The Down’s syndrome screening test is a test used to check if the baby is at risk of developing Down’s syndrome. Down’s syndrome is a chromosomal abnormality. The older the mother is at the time of pregnancy and the worse the ovarian function, the higher the risk of the fetus developing Down’s syndrome. Nutrient deficiencies or viral infections during pregnancy, or damage from physical or chemical factors, also tend to increase the chance of Down syndrome. Because children with Down syndrome have severe defects in mental development and physical development, which have a significant impact on viability and quality of life, Down syndrome screening should be routinely performed during pregnancy. If the test results are abnormal, further tests are needed to clarify the diagnosis and eliminate the birth of Down’s syndrome.