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Factors affecting the aldosterone/renin ratio.
M Stowasser1, A H Ahmed, E Pimenta
1Endocrine Hypertension Research Centre, University of Queensland School of Medicine, Greenslopes and Princess-Alexandra Hospitals, Brisbane, Australia. m.stowasser@uq.edu.au
Hormone and Metabolic Research = Hormon- Und Stoffwechselforschung = Hormones Et Metabolisme
|December 8, 2011
Summary
The aldosterone/renin ratio (ARR) screening test for primary aldosteronism can yield inaccurate results. Various medications, physiological states, and patient factors can cause false positives or negatives, necessitating careful interpretation and confirmatory testing.
Area of Science:
- Endocrinology
- Clinical Chemistry
Background:
- The aldosterone/renin ratio (ARR) is a key screening tool for primary aldosteronism.
- However, numerous factors can lead to inaccurate ARR results, impacting diagnosis.
Purpose of the Study:
- To comprehensively review factors influencing the accuracy of the aldosterone/renin ratio (ARR) in screening for primary aldosteronism.
- To provide guidance on optimizing ARR testing conditions and interpreting results.
Main Methods:
- Literature review of factors affecting ARR.
- Analysis of recent findings on medication, physiological, and demographic influences.
- Discussion of pre-analytical and analytical considerations for ARR measurement.
Main Results:
- Medications (diuretics, SSRIs, beta-blockers, NSAIDs) and conditions (hypokalemia, hypertension, renal dysfunction, age) can cause false negatives or positives.
- Female sex, luteal phase, and specific oral contraceptives can affect ARR, particularly with direct renin assays.
- Optimizing pre-test conditions (medication withdrawal, salt loading, posture, timing) improves test sensitivity.
Conclusions:
- The ARR is a screening test requiring careful interpretation due to potential inaccuracies.
- Understanding and mitigating interfering factors are crucial for reliable primary aldosteronism screening.
- Advanced assays like LC-MS/MS may improve diagnostic accuracy.
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