Question 55

Amniocentesis is best described as removing fluid to test for chromosomal abnormalities and fetal infections.

Amniocentesis is a procedure that involves extracting amniotic fluid to analyze fetal cells for chromosomal abnormalities and potential infections, making it a critical diagnostic tool in prenatal care.

A) Removing cells from the placenta using a catheter

This option describes a different procedure known as chorionic villus sampling (CVS), which involves taking samples from the placenta. Unlike amniocentesis, which focuses on amniotic fluid, CVS targets placental tissue and is performed earlier in pregnancy.

B) Taking blood samples from the mother to test for specific proteins

This statement refers to maternal blood tests, such as the quadruple screen, which assess certain proteins associated with fetal development. However, it does not involve the invasive technique of amniocentesis, which requires sampling amniotic fluid.

C) Removing fluid to test for chromosomal abnormalities and fetal infections

This is the correct description of amniocentesis. The procedure specifically involves extracting amniotic fluid to conduct tests for chromosomal conditions, such as Down syndrome, as well as to detect infections affecting the fetus.

D) Using high-frequency sound waves to generate a picture of the fetus

This option describes an ultrasound, a non-invasive imaging technique used to visualize the developing fetus. It does not involve fluid removal or the diagnostic analysis characteristic of amniocentesis.

Conclusion

Amniocentesis is accurately defined by option C, as it specifically entails the extraction of amniotic fluid for the purpose of identifying chromosomal abnormalities and infections in the fetus. Other options either relate to different medical procedures or do not encompass the invasive nature of amniocentesis, thus reinforcing option C as the definitive correct answer.