Spencer, K <br/><br/>
Is maternal serum total hCG a marker of trisomy 21 in the first trimester of pregnancy?  [electronic resource] 

 -  Prenatal diagnosis  Apr 2000 
 - 311-7 p.  digital 
<br/><br/> Publication Type: Journal Article 
<br/><br/><label>ISSN: </label>0197-3851 
<br/><br/><label>Standard No.: </label>10.1002/(sici)1097-0223(200004)20:4<311::aid-pd809>3.0.co;2-p  doi 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Adolescent<br/>Adult<br/>Biomarkers--blood<br/>Chorionic Gonadotropin--blood<br/>Chorionic Gonadotropin, beta Subunit, Human--blood<br/>Down Syndrome--blood<br/>Female<br/>Gestational Age<br/>Humans<br/>Pregnancy<br/>Pregnancy Trimester, First<br/>Pregnancy-Associated Plasma Protein-A--analysis<br/>alpha-Fetoproteins--analysis