The frequency of trisomy 21 in the population is approximately 1 in 650 to 1,000 live births. Checking your baby's health before birth. Checking your baby's health before birth.
Every couple wants to have a healthy baby.
For most couples, that will come true. However, there are some couples who have a greater chance than others of having a baby with a birth defect. Special tests are available which are carried out during pregnancy to determine if the baby has a particular problem. These tests are generally referred to as prenatal diagnosis. Although prenatal diagnosis is highly accurate, a normal test result cannot show up every possible problem with the baby .