Assertion: amniocentesis | /r/HasProperty | performed after last menstrual period
Facets:
value: between the 12th
type: TEMPORAL
value: between the 16th week
type: TEMPORAL
value: usually
type: TEMPORAL
Source sentences:
text: Amniocentesis is usually performed between the 12th and the 16th week, after the last menstrual period when there is enough fluid surrounding the baby that a sample is possible.