Wøjdemann, K R <br/><br/>
Improved first-trimester Down syndrome screening performance by lowering the false-positive rate: a prospective study of 9941 low-risk women.  [electronic resource] 

 -  Ultrasound in obstetrics & gynecology : the official journal of the International Society of Ultrasound in Obstetrics and Gynecology  Mar 2005 
 - 227-33 p.  digital 
<br/><br/> Publication Type: Journal Article; Research Support, Non-U.S. Gov't 
<br/><br/><label>ISSN: </label>0960-7692 
<br/><br/><label>Standard No.: </label>10.1002/uog.1834  doi 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Adult<br/>Chorionic Gonadotropin, beta Subunit, Human--blood<br/>Chromosome Disorders--diagnosis<br/>Down Syndrome--diagnosis<br/>False Positive Reactions<br/>Female<br/>Humans<br/>Maternal Age<br/>Nuchal Translucency Measurement<br/>Predictive Value of Tests<br/>Pregnancy<br/>Pregnancy Trimester, First<br/>Pregnancy-Associated Plasma Protein-A--analysis<br/>Prospective Studies<br/>Risk Assessment<br/>Ultrasonography, Prenatal