Key result
A fluorimetric method using thin-layer chromatography accurately estimated urinary aldosterone, with mean 24-hour excretion of 15.7 nmol and overnight excretion of 2.6 nmol in normal adults.
Why the study?
Is overnight urinary aldosterone estimation using thin-layer chromatography and fluorimetry as effective as 24-hour assays for identifying patients with hyperaldosteronism?
Is overnight urinary aldosterone estimation using thin-layer chromatography and fluorimetry as effective as 24-hour assays for identifying patients with hyperaldosteronism?
Overnight urinary aldosterone estimation using thin-layer chromatography and fluorimetry is an accurate alternative to 24-hour assays for detecting hyperaldosteronism.
May simplify aldosterone assessment via overnight collection; leaves open diagnostic performance in hyperaldosteronism without validation studies.
AIMS: To develop a fluorimetric method for the estimation of urinary aldosterone; to establish a normal range in 24 hour and overnight urine samples; and to investigate the use of overnight urines for detecting hyperaldosteronism. METHODS: Essential steps include hydrolysis of the 18 conjugate to release aldosterone and its oxidation with Benedict's solution, followed by thin-layer chromatography on silica gel and development of fluorescence on the plate with sulphuric acid. RESULTS: There was a linear correlation between the amount of aldosterone and the area under the peak on the chromatogram. The mean intra-assay and interassay coefficients of variation were 4.4% and 6.8%, respectively. The mean aldosterone excretion in 67 adults was 15.7 (SD 8.1) nmol/24 hours. The mean overnight excretion in 65 adults was 2.6 (1.4) nmol/8 hours. The method detected raised concentrations in patients with primary and secondary aldosteronism. CONCLUSIONS: This technique provides an accurate means of assaying urinary aldosterone. Overnight estimations seem to be as effective as 24 hour assays for identifying patients with hyperaldosteronism.
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Mattingly et al. (1993) studied Hyperaldosteronism. Fluorimetric method using thin-layer chromatography was evaluated on Mean aldosterone excretion. A fluorimetric method using thin-layer chromatography accurately estimated urinary aldosterone, with mean 24-hour excretion of 15.7 nmol and overnight excretion of 2.6 nmol in normal adults.
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