Second Trimester

Diagnostic Tests During the Second Trimester

Diagnostic tests can give definite answers about whether your baby has a birth defect. But, unlike screening tests, they are invasive or present a risk of miscarriage. Amniocentesis and chorionic villus sampling (CVS) are the two most commonly used diagnostic tests. Both tests are more than 99 percent accurate for finding these problems. These tests also can tell you your baby's sex. In most cases, results take about two weeks.
 
Diagnostic tests performed during the second trimester include:
 
  • Amniocentesis
  • Chorionic villus sampling (CVS).
     
Amniocentesis
This test is performed in pregnancies of at least 16 weeks. It involves your doctor inserting a thin needle through your abdomen into your uterus and into the amniotic sac to take out a small amount of amniotic fluid for testing. The cells from the fluid are grown in a lab to look for problems with chromosomes. The fluid also can be tested for AFP. About 1 in 200 women have a miscarriage as a result of this test.
 
Chorionic Villus Sampling (CVS)
This test is performed between the 10th and 12th weeks of pregnancy. It involves your doctor inserting a needle through your abdomen or inserting a catheter through your cervix to reach the placenta. Your doctor will then take a sample of cells from the placenta, which is then grown in a lab to look for problems with chromosomes. This test cannot find out whether your baby has open neural tube defects. About 1 in 200 women have a miscarriage as a result of this test.
 
Pregnancy and Pain

Pregnancy Info

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