At the 10-week mark, your doctor may ask whether you'd like a CVS test to reveal genetic conditions like Down syndrome. Chorionic villus sampling is recommended to women age 35 and older, and women with a family history of genetic disorders. A catheter is inserted into the vagina and through the cervix to remove a small sample of placenta. Or, a needle is inserted into the abdomen. Regardless of method, CVS is one of the more invasive tests performed during pregnancy; there is a 1 in 100 chance it could trigger a miscarriage.
So why consent to the test? The results, which are available within seven to 14 days, are 99 percent accurate when it comes to diagnosing many genetic and chromosomal abnormalities. And, unlike an amniocentesis test that can only be given in the second trimester, you receive CVS results before your first trimester ends. Keep in mind, however, that a CVS test doesn't rule every abnormality.
Week 10 also is a good time to revisit the importance of prenatal supplements. Powdered or liquid prenatal vitamins are easier to swallow than those in pill form and won't wreak as much digestive havoc.