The test measures the amount of four proteins in the mother’s blood. However, it is best if the blood is collected between 15 and 17 weeks gestation. The test involves the pregnant woman having a blood test between 14 and 20 weeks + 6 days gestation. The second trimester maternal serum screening test can identify a pregnancy with increased chance of Down syndrome, Edward syndrome or neural tube defects. Second trimester maternal serum screening test There may be gap payments depending on the service you are attending – discuss this with your health professional. Your GP (doctor) or medical specialist can order this test. If the nasal bone is absent, there may be an increased chance of Down syndrome. All babies at this stage of pregnancy have fluid at the back of their neck, but babies with Down syndrome or Edward syndrome tend to have more fluid.ĭuring the ultrasound, the specialist performing the scan may also report the presence or absence of the nasal bone. This measurement is called the nuchal translucency. Using ultrasound, a measurement of the amount of fluid in the skin at the back of the baby’s neck is taken. The blood test measures the amount of two different proteins that occur naturally in the mother’s blood during pregnancy. ![]() This test involves the pregnant woman having a blood test between 9 and 13 weeks gestation, and an ultrasound between 11 and 13 weeks gestation. The combined first trimester screening test can identify a pregnancy with increased chance of Down syndrome (trisomy 21) and Edward syndrome (trisomy 18). A low-chance result does not mean the baby is free of other birth defects. Neural tube defects can also be diagnosed by routine ultrasound tests during pregnancy. Neural tube defects are only screened for in the second trimester MSS test. This can cause weakness and paralysis of the legs, and sometimes inability to control the bowel and bladder. Babies with spina bifida have an opening in the bones of the spine that can result in damage to the nerves controlling the lower part of the body. With anencephaly, the brain does not develop properly and the baby does not survive. Neural tube defects – the most common neural tube defects are anencephaly and spina bifida.Edward syndrome is also known as trisomy 18 because the baby has three copies of chromosome 18, instead of the usual two Many do not live beyond the first few weeks of life. Babies born with Edward syndrome have a poor prognosis. Edward syndrome – a condition that results in physical problems such as growth deficiency, heart defects, digestive system defects and intellectual disability.Down syndrome is also known as trisomy 21 because the baby has three copies of chromosome 21, instead of the usual two It may cause some physical problems such as heart defects or difficulties with sight or hearing. Down syndrome – a condition that results in intellectual disability of varying degrees. ![]() MSS can identify pregnancies that are at increased chance of: Maternal serum screening tests for various conditions This is called the second trimester maternal serum screening test. ![]() Or, testing may be performed in the second trimester of pregnancy. This is called the combined first trimester screening test. Maternal serum screening may be done in the first trimester of pregnancy, when it is combined with an ultrasound. It helps determine the chance of their unborn child having Down syndrome (trisomy 21), Edward syndrome (trisomy 18) or a neural tube defect. The maternal serum screening (MSS) test is a blood test available to pregnant women in Victoria.
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