Assertion: amniocentesis | /r/HasProperty | withdrawn with needle
Facets:
value: from the amniotic sac
type: LOCATION
value: under ultrasound guidance
type: OTHER
Source sentences:
text: Amniocentesis is a procedure that, under ultrasound guidance, a small amount of amniotic fluid is withdrawn with a needle from the amniotic sac, the self-contained fluid-filled membrane surrounding the baby.