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Renin-aldosterone testing: The essentials
Eunice K T Phillips1, Abilash Sathyanarayanan2
1Oxford University School of Medicine & Biomedical Sciences, University of Oxford, Oxford, UK.
Clinical Medicine (London, England)
|April 4, 2026
Summary
Primary Aldosteronism (PA), a common cause of hypertension, is underdiagnosed. Early screening and treatment significantly reduce cardiovascular and renal risks in affected patients.
Area of Science:
- Endocrinology
- Cardiology
- Nephrology
Background:
- Primary Aldosteronism (PA) is an underdiagnosed cause of secondary hypertension, affecting approximately 9.4% of hypertensive adults.
- PA patients have significantly higher risks of adverse cardiovascular and renal outcomes.
- Early diagnosis and treatment can substantially mitigate these risks.
Purpose of the Study:
- To provide a practical, evidence-based approach for PA screening in generalist settings.
- To focus on contemporary test interpretation and common pitfalls in PA diagnosis.
- To encourage improved screening rates for greater global health benefit.
Main Methods:
- Screening involves a simple blood test measuring plasma aldosterone and renin levels.
- The diagnostic hallmark is renin-independent aldosterone production, indicated by suppressed renin.
- Initial testing is recommended on the current antihypertensive regimen, with medication withdrawal if results are inconclusive.
Main Results:
- Renin-independent aldosterone production is the key diagnostic indicator.
- Most antihypertensive medications can interfere with initial test results.
- Specialist referral is indicated for suspected PA or complex cases, such as those with chronic kidney disease.
Conclusions:
- Improving PA screening offers a significant opportunity to reduce hypertension-related morbidity and mortality globally.
- Practical screening guidelines are essential for generalist settings to address the underdiagnosis of PA.
- Timely diagnosis and targeted treatment of PA are crucial for mitigating adverse patient outcomes.
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