What prenatal technique uses a long, hollow needle to extract amniotic fluid at 15 to 20 weeks of pregnancy to examine the fetus's genotype?

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Amniocentesis is the prenatal technique that uses a long, hollow needle to extract amniotic fluid at 15 to 20 weeks of pregnancy to examine the fetus's genotype. Chorionic villus sampling, on the other hand, takes a sample of the placenta, and alphafetal protein is a blood test that can screen for certain developmental problems. Ultrasound is a prenatal technique that uses sound waves to produce images of the fetus.

What Prenatal Technique Uses a Long, Hollow Needle to Extract