Amniocentesis, chorionic villi and alpha-fetoprotein sampling are performed to determine

The correct answer is "Whether the baby will be normal or abnormal".

Amniocentesis, chorionic villus sampling (CVS), and alpha-fetoprotein (AFP) screening are all prenatal diagnostic procedures. Their primary objective is to assess the health of the developing fetus before birth by identifying potential genetic, chromosomal, or developmental abnormalities.

Each of these procedures works in the following ways:
1. Amniocentesis: This involves analyzing a small sample of amniotic fluid surrounding the fetus to detect chromosomal conditions (like Down syndrome), genetic disorders (like cystic fibrosis), or neural tube defects.
2. Chorionic Villi Sampling: This test examines cells from the placenta (chorionic villi) to identify chromosomal abnormalities and other inherited genetic disorders early in pregnancy.
3. Alpha-Fetoprotein (AFP) Sampling: This is a blood test that measures the levels of AFP in the mother's blood (or sometimes in amniotic fluid) to screen for risk factors like neural tube defects (e.g., spina bifida) or chromosomal issues.

Therefore, these diagnostic methods are specifically performed to determine whether the baby will be normal or abnormal (i.e., whether the fetus is developing normally or possesses a birth defect or genetic condition).