The effect of storage conditions on salivary cortisol concentrations using an enzyme immunoassay.
Scand J Clin Lab Invest
; 75(1): 92-5, 2015 Jan.
Article
en En
| MEDLINE
| ID: mdl-25510953
ABSTRACT
Saliva samples are easy to collect and are applicable for home-sampling, e.g. when studying HPA-axis dynamics to characterize diurnal cortisol profiles and the cortisol awakening response. However, the storing and transport conditions might be critical in the home-sampling approach. Here, we tested the stability of saliva cortisol in samples stored at different temperatures and after repeated thawing-freezing cycles when measured with an Enzyme Immuno Assay (EIA). Thirteen healthy volunteers, six women and seven men, mean age 31 (range 26-49) years collected saliva either in the morning hours (0800-1000 h) or before lunch (1100-1200 h). Storage at six different conditions were tested Storage at - 18°C, - 4°C, 4°C and room temperature for 72 h. One condition tested was at - 18°C for 72 h and then kept in an envelope for 72 h with a freezing element in room temperature surroundings where after it was stored at - 80°C. The last tube was stored directly at - 80°C and served as the 'gold standard'. The saliva samples were assayed using Salivary Cortisol Diagnostic EIA. Differences in cortisol measurements between each of the five conditions and the 'gold standard' (- 80°C) were evaluated by one-sample t-test. No significant differences were observed. This indicates that an EIA method can be used reliably when measuring salivary cortisol samples obtained by home-sampling including a postal delivery.
Palabras clave
Texto completo:
1
Colección:
01-internacional
Base de datos:
MEDLINE
Asunto principal:
Saliva
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Hidrocortisona
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Criopreservación
Límite:
Adult
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Female
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Humans
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Male
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Middle aged
Idioma:
En
Revista:
Scand J Clin Lab Invest
Año:
2015
Tipo del documento:
Article
País de afiliación:
Dinamarca