Document Detail


Gestational age-related reference values for amniotic fluid organic acids.
MedLine Citation:
PMID:  19950217     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
BACKGROUND: Normative data for amniotic fluid (AF) levels of organic acids at different gestational ages are lacking. They can provide a useful framework to investigate the accuracy of prenatal diagnosis for organic acidemias. METHODS: We report on the concentration of 21 organic acids in AF obtained by gas chromatography/mass spectrometry between the 12th and 34th weeks of gestation from 92 pregnancies that were not at risk for organic acidurias. RESULTS: We infer normal reference values that can be compared with 134 pregnancies at risk for several metabolic conditions, that is, propionic acidemia, methylmalonic acidemia (methylmalonyl-CoA mutase deficiency or defects in cobalamin metabolism), 4-hydroxybutyric acidemia, glutaric acidemia and pyroglutamic acidemia. CONCLUSION: Most of the metabolites tested did not show conspicuous variations across gestational ages in normal fetuses, with ranges that were consistently similar to available reference values from pooled samples in previous reports. With rare exceptions, knowledge of pathological versus normal values for relevant metabolites leads to clear-cut differentiation of affected versus unaffected fetuses. Nevertheless, it is strongly recommended that mutational analysis and/or additional biochemical approaches complement organic acid analysis for an adequate diagnostic workup.
Authors:
C Ottolenghi; N Abermil; A Lescoat; J Aupetit; O Beaugendre; N Morichon-Delvallez; D Ricquier; B Chadefaux-Vekemans; D Rabier
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Prenatal diagnosis     Volume:  30     ISSN:  1097-0223     ISO Abbreviation:  Prenat. Diagn.     Publication Date:  2010 Jan 
Date Detail:
Created Date:  2009-12-28     Completed Date:  2010-03-09     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8106540     Medline TA:  Prenat Diagn     Country:  England    
Other Details:
Languages:  eng     Pagination:  43-8     Citation Subset:  IM    
Copyright Information:
Copyright (c) 2009 John Wiley & Sons, Ltd.
Affiliation:
Metabolic Biochemistry Unit, H?pital Necker-Enfants Malades, Paris, France. chris.ottolenghi@nck.aphp.fr
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MeSH Terms
Descriptor/Qualifier:
Adult
Amino Acid Metabolism, Inborn Errors / diagnosis*
Amniotic Fluid / chemistry*
Carboxylic Acids / analysis*
Female
Gestational Age
Humans
Pregnancy
Prenatal Diagnosis / methods*,  statistics & numerical data
Reference Values
Chemical
Reg. No./Substance:
0/Carboxylic Acids

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