Document Detail

Establishment of reference values for endocrine tests. III: Primary aldosteronism.
MedLine Citation:
PMID:  12735419     Owner:  NLM     Status:  MEDLINE    
BACKGROUND: In our laboratory well-defined reference values for the screening test and confirmation test used in the diagnosis of primary aldosteronism were lacking. In this study we established the reference-values of the plasma aldosterone concentration (PA), plasma renin activity (PRA) and PA/PRA ratio after a two-hour upright period, and of the urinary aldosterone excretion after oral sodium loading. METHODS: Fifty healthy volunteers, equally distributed according to sex and aged between 20 and 70 years, went through the screening and confirmation test of primary aldosteronism. PA, PRA and the PA/PRA ratios were measured after a two-hour upright period (screening test). Urinary aldosterone excretion was determined in two 24-hour urine samples after an oral suppletion of 6 g NaCl a day for five days (confirmation test). RESULTS: The following reference values were established: PA (after two-hour upright position) <0.03-1.05 nmol/l (mean: 0.47), PA/PRA ratio 0.05-0.47 (mean: 0.15) and urinary aldosterone excretion after sodium loading <3.0-47.0 nmol/24h (mean: 10.5). PRA showed a significant decrease with advancing age: median values in the 3rd to 7th decade are 3.9, 3.5, 2.5, 1.6 and 2.1 ng A1/ml/h respectively (p=0.04). PA was lower in subjects > or = 50 years old. Age did not affect the PA/PRA ratio or the urinary aldosterone excretion. There were no significant differences between the sexes in any of the above-mentioned parameters. CONCLUSION: In this study we established reference values for the screening and confirmation test used in the diagnosis of primary aldosteronism.
S J Baas; E Endert; E Fliers; M F Prummel; W M Wiersinga
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  The Netherlands journal of medicine     Volume:  61     ISSN:  0300-2977     ISO Abbreviation:  Neth J Med     Publication Date:  2003 Feb 
Date Detail:
Created Date:  2003-05-08     Completed Date:  2003-06-02     Revised Date:  2004-11-17    
Medline Journal Info:
Nlm Unique ID:  0356133     Medline TA:  Neth J Med     Country:  Netherlands    
Other Details:
Languages:  eng     Pagination:  37-43     Citation Subset:  IM    
Department of Endocrinology and Metabolism, Academic Medical Centre of the University of Amsterdam, PO Box 22660, 1100 DD Amsterdam, the Netherlands.
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MeSH Terms
Aldosterone / blood*
Diagnostic Techniques, Endocrine / standards*
Diagnostic Tests, Routine
Hyperaldosteronism / blood*,  diagnosis*
Middle Aged
Reference Values
Renin / blood*
Reg. No./Substance:
52-39-1/Aldosterone; EC

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