Document Detail

Inhibin A is a maternal serum marker for Down's syndrome early in the first trimester.
MedLine Citation:
PMID:  15952984     Owner:  NLM     Status:  MEDLINE    
Inhibin A is a maternal serum marker for fetal Down's syndrome (DS) in the second trimester. We examined whether inhibin A could be used early in the first trimester. Maternal serum concentrations of inhibin A were determined in 81 controls and 27 cases of fetal trisomy 21 in gestational week 5-11. The log MoM (Multiple of the Median of normal pregnancies) inhibin A concentration in DS pregnancies increased with gestational age (p = 0.001) from a mean log MoM (standard deviation) of -0.1754 (0.3712) (n = 11) in week 7-8 to a mean log MoM (standard deviation) of 0.1842 (0.2145) (n = 12) in week 9-11. This corresponded to an increase in inhibin median MoM from 0.67 to 1.53. When inhibin A was used together with pregnancy-associated plasma protein-A, free beta-human chorionic gonadotrophin and nuchal translucency as DS markers, the estimated detection rates were 81.4 and 82.6% in weeks 7-8 and 9-11, respectively, for false-positive rates of 0.9 and 1.0%. The performance of the latter combination early in the first trimester is nearly as good as that of integrated first- and second-trimester screening, with the further advantage that the risk can be reported to the pregnant woman in first trimester.
M Christiansen; B Nørgaard-Pedersen
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Clinical genetics     Volume:  68     ISSN:  0009-9163     ISO Abbreviation:  Clin. Genet.     Publication Date:  2005 Jul 
Date Detail:
Created Date:  2005-06-14     Completed Date:  2005-09-21     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0253664     Medline TA:  Clin Genet     Country:  Denmark    
Other Details:
Languages:  eng     Pagination:  35-9     Citation Subset:  IM    
Department of Clinical Biochemistry, Statens Serum Institut, Copenhagen, Denmark.
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MeSH Terms
Biological Markers / blood
Chorionic Gonadotropin, beta Subunit, Human / blood
Down Syndrome / diagnosis*
False Positive Reactions
Inhibins / blood*
Pregnancy Trimester, First
Pregnancy-Associated Plasma Protein-A / analysis
Prenatal Diagnosis / methods*
Reference Values
Reg. No./Substance:
0/Biological Markers; 0/Chorionic Gonadotropin, beta Subunit, Human; 0/inhibin A; 57285-09-3/Inhibins; EC 3.4.24.-/Pregnancy-Associated Plasma Protein-A

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