Amniocentesis , or an Amniotic Fluid Test (AFT) , is a medical procedure used for prenatal diagnosis, in which a small amount of amniotic fluid is extracted from the amnion around a developing fetus.

• 羊膜穿刺术可以快速且安全地取得胎儿周边的羊水。这项试验最早可以在怀孕第13周施行。