Which screening test is commonly performed in the first trimester of pregnancy?

Chorionic villus sampling (CVS) is a screening test commonly performed in the first trimester of pregnancy. It involves taking a small sample of tissue from the placenta, which contains the same genetic material as the fetus. This procedure allows for the early detection of certain genetic disorders and chromosomal abnormalities, enabling parents to make informed decisions about their pregnancy and prepare for any necessary medical interventions.

CVS is typically offered between 10 and 13 weeks of gestation, making it one of the key prenatal diagnostic tests in the early stages of pregnancy. Its ability to provide early insights into the fetal genome distinguishes it from other options available during pregnancy. In contrast, tests like the blood glucose test and gestational diabetes test are performed later in pregnancy to assess glucose levels and the potential for diabetes, while the alpha-fetoprotein test is usually conducted in the second trimester to screen for certain birth defects, such as neural tube defects.