Document Detail


Biological variation of free β chorionic gonadotropin and pregnancy-associated plasma protein A in first trimester pregnancies.
MedLine Citation:
PMID:  21091265     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
Abstract Background: Trisomy 21 risk estimation in first trimester pregnancies can be performed by a combined test based on ultrasound measurement of fetal nuchal translucency thickness and maternal plasma concentrations of free β human chorionic gonadotropin (hCGβ) and pregnancy-associated plasma protein A (PAPP-A). However, little knowledge exists regarding the biological variation of hCGβ and PAPP-A when the time interval between sampling increases. Methods: We estimated these variations from double measurements of hCGβ and PAPP-A in first trimester pregnancies in 167 women. Data were divided into three groups based on the number of days between sampling. The correlation coefficients and biological variation were estimated for each group. Results: The correlation coefficient between the first and second samples was 0.841 for hCGβ, and 0.706 for PAPP-A. The ranges for biological variation were 11.9%-48.5% for hCGβ and 31.6%-63.3% for PAPP-A, increasing with time between sampling. The average overall biological variation for hCGβ was 29%, and 49.7% for PAPP-A. Conclusions: We found high biological variation for plasma concentrations of hCGβ and PAPP-A, increasing with longer time intervals between sampling. From our data that showed high correlation of hCGβ and PAPP-A in the first and second sample, we found no reason to recommend retesting. However, new studies should clarify whether PAPP-A should be collected early, and hCGβ late, in the first trimester of pregnancy.
Authors:
Henriette P Sennels; Finn Stener Jørgensen; Steen Sørensen
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2010-11-23
Journal Detail:
Title:  Clinical chemistry and laboratory medicine : CCLM / FESCC     Volume:  -     ISSN:  1434-6621     ISO Abbreviation:  Clin. Chem. Lab. Med.     Publication Date:  2010 Nov 
Date Detail:
Created Date:  2010-11-24     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9806306     Medline TA:  Clin Chem Lab Med     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Affiliation:
Department of Clinical Biochemistry, Hvidovre Hospital, University of Copenhagen, Denmark.
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