Which medical procedure is used to obtain amniotic fluid?

Amniocentesis is the correct procedure for obtaining amniotic fluid, which is essential for various medical assessments during pregnancy. This procedure involves using a thin needle to extract a small amount of amniotic fluid from the amniotic sac surrounding a developing fetus. The fluid contains various fetal cells and substances that can provide important information about the fetus's genetic health, development, and the presence of certain conditions.

In contrast, amenorrhea refers to the absence of menstruation and is not a procedure but rather a medical condition. Anastomosis involves connecting two structures, such as blood vessels or sections of the intestine, and has no relationship to the collection of amniotic fluid. Amelioration pertains to the act of improving or making a situation better, which also does not pertain to any medical procedure for obtaining amniotic fluid. Understanding these distinctions clarifies why amniocentesis is the appropriate choice for the procedure in question.