Stability of ketone bodies in serum in dependence on storage time and storage temperature.
Clin Lab
; 47(7-8): 399-403, 2001.
Article
em En
| MEDLINE
| ID: mdl-11499803
ABSTRACT
The serum concentrations of beta-hydroxybutyrate and acetoacetate as well as the beta-hydroxybutyrate/acetoacetate ratio are important parameters for the differential diagnosis of certain inborn errors of metabolism. Acetoacetate, however, is an unstable compound which becomes rapidly decarboxylated. At a storage temperature of -20 degrees C about 40% of the acetoacetate is lost within 7 days and after 40 days storage at this temperature virtually all of the acetoacetate has become degraded. At -80 degrees C the decomposition of acetoacetate occurs with a much slower rate and only 15% of the initial acetoacetate is lost after 40 days storage. The rate constants for the decarboxylation reaction were found to be (6.4 +/- 2.9) * 10(-5) [min(-1)] at -20 degrees C and (0.4 +/- 0.3) * 10(-5) [min(-1)] at -80 degrees C. In contrast, beta-hydroxybutyrate is very stable during storage and hence should be used as main parameter for the evaluation of ketonemia. If determination of acetoacetate and/or of the beta-hydroxybutyrate/acetoacetate ratio is necessary, an assay immediately after collecting the serum samples is recommended. Otherwise, the serum samples should be frozen as soon as possible and stored at -80 degrees C during transport and storage.
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Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Preservação de Sangue
/
Corpos Cetônicos
Tipo de estudo:
Diagnostic_studies
Limite:
Child
/
Female
/
Humans
/
Male
Idioma:
En
Revista:
Clin Lab
Assunto da revista:
TECNICAS E PROCEDIMENTOS DE LABORATORIO
Ano de publicação:
2001
Tipo de documento:
Article
País de afiliação:
Alemanha