Gestational age-related reference values for amniotic fluid organic acids.
Prenat Diagn
; 30(1): 43-8, 2010 Jan.
Article
en En
| MEDLINE
| ID: mdl-19950217
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.
Texto completo:
1
Colección:
01-internacional
Base de datos:
MEDLINE
Asunto principal:
Diagnóstico Prenatal
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Ácidos Carboxílicos
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Errores Innatos del Metabolismo de los Aminoácidos
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Líquido Amniótico
Tipo de estudio:
Diagnostic_studies
Límite:
Adult
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Female
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Humans
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Pregnancy
Idioma:
En
Revista:
Prenat Diagn
Año:
2010
Tipo del documento:
Article
País de afiliación:
Francia
Pais de publicación:
Reino Unido