A 41-year-old woman has made the recent decision to start a family and is eager to undergo testing to mitigate the possibility of having a child with Down syndrome. Which test is most likely to provide the data the woman seeks?

Explanation:

A 41 year old woman already has a fat chance of giving birth to a down syndrome child, as statistics states a likelihood of 1 in 85 cases.

Test is done when the woman is already pregnant

1. Amniocentesis (also called amnio). This test takes some amniotic fluid from the fetus to check for Down syndrome. It can be done at 15 to 20 weeks of pregnancy. 

2 Chorionic villus sampling (also called CVS). This test checks tissue from the placenta to see if a baby has Down syndrome. CVS can be done at 10 to 13 weeks of pregnancy. 

3. Cordocentesis (also called percutaneous umbilical cord sampling or PUBS).  a thin needle into an umbilical cord vein to take a small sample fetus blood to check for chromosome defects. test can be done between 18 and 22 weeks of pregnancy.

the answer is nerve impulses.

good