Gestational age:Time:Pt:^Fetus:Qn:Amniocentesis
gestational age:time:pt:^fetus:qn:amniocentesis
Gestational age:Time:To identify measures at a point in time:^Fetus:Quantitative:Amniocentesis
gestational age:time:to identify measures at a point in time:^fetus:quantitative:amniocentesis