A procedure that can be used within the first trimester of pregnancy to test fetal cells for defective conditions is

A) amniocentesis.
B) chorionic villus sampling.
C) maternal blood test.
D) All of these

Amniocentesis

Amniocentesis is a medical procedure used in prenatal diagnosis, where a small amount of amniotic fluid, which contains fetal tissues, is extracted from the amnion or amniotic sac surrounding a developing fetus, to test for genetic conditions or other fetal infections.

Chorionic Villus Sampling

A prenatal test where a small sample of the placental tissue (chorionic villi) is taken to test for chromosomal abnormalities and certain other genetic problems.

Fetal Cells

Cells that make up the developing fetus in the womb, which possess the ability to divide and specialize into various cell types.