Trisomy 18 risk cutoff:Find:Pt:^Fetus:Qn
trisomy 18 risk cutoff:find:pt:^fetus:qn
Trisomy 18 risk cutoff:Finding:To identify measures at a point in time:^Fetus:Quantitative
trisomy 18 risk cutoff:finding:to identify measures at a point in time:^fetus:quantitative