I know as well from my sister in laws experience that women who need screening later in their pregnancy are often offered the quadruple test that involves a blood test for 4 different chemicals combined with maternal age.
I that that it is important for parents to realise that any screening only identifies women who are at an increased risk of having a baby with Down's and estimates the extent of that risk it doesn't actually tell them for certain whether or not their baby has Down's.
Those women who are found to be at a higher risk of having a baby with Down's syndrome are offered the opportunity to have further tests to establish whether or not their child is actually affected. This may be amniocentesis or chorionic villus sampling. These provide a definitive answer, but, as my sister in law as told they can trigger a miscarriage.
The other thing is that screening for Down's syndrome isn't compulsory. Women are offered it if they want to know the likelihood of having a baby with Down's syndrome. If they are at high risk, then they can then decide whether to go on for the definitive test.
If this test confirms Down's syndrome, women can then make an informed decision about continuing with their pregnancy or not.
Thank God my sister in law who did have all the tests did not have to face this choice as her baby did not have the condition. I know as well that some people do not have the test at all as they would not have a termination if the baby had Down's syndrome.
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