Wald, N J <br/><br/>
Combining ultrasound and biochemistry in first-trimester screening for Down's syndrome.  [electronic resource] 

 -  Prenatal diagnosis  Sep 1997 
 - 821-9 p.  digital 
<br/><br/> Publication Type: Journal Article 
<br/><br/><label>ISSN: </label>0197-3851 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Chorionic Gonadotropin--blood<br/>Down Syndrome--blood<br/>False Positive Reactions<br/>Female<br/>Fetal Diseases--blood<br/>Genetic Testing--methods<br/>Humans<br/>Maternal Age<br/>Neck--diagnostic imaging<br/>Pregnancy--blood<br/>Pregnancy Trimester, First<br/>Pregnancy-Associated Plasma Protein-A--analysis<br/>Prenatal Diagnosis--methods<br/>Risk Factors<br/>Statistics as Topic<br/>Ultrasonography, Prenatal--methods