Spencer, K <br/><br/>
First trimester biochemical screening for trisomy 21: the role of free beta hCG, alpha fetoprotein and pregnancy associated plasma protein A.  [electronic resource] 

 -  Annals of clinical biochemistry  Sep 1994 
 - 447-54 p.  digital 
<br/><br/> Publication Type: Clinical Trial; Controlled Clinical Trial; Journal Article; Multicenter Study 
<br/><br/><label>ISSN: </label>0004-5632 
<br/><br/><label>Standard No.: </label>10.1177/000456329403100504  doi 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Adolescent<br/>Adult<br/>Biomarkers--blood<br/>Blood Proteins--metabolism<br/>Chorionic Gonadotropin--blood<br/>Chorionic Gonadotropin, beta Subunit, Human<br/>Down Syndrome--blood<br/>Enzyme-Linked Immunosorbent Assay<br/>Estriol--blood<br/>False Positive Reactions<br/>Female<br/>Fetal Diseases--blood<br/>Humans<br/>Likelihood Functions<br/>Longitudinal Studies<br/>Peptide Fragments--blood<br/>Predictive Value of Tests<br/>Pregnancy<br/>Pregnancy Trimester, First<br/>Pregnancy Trimester, Second<br/>Pregnancy-Associated Plasma Protein-A--metabolism<br/>Prenatal Diagnosis<br/>ROC Curve<br/>Risk Factors<br/>United Kingdom<br/>alpha-Fetoproteins--metabolism