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To establish normal ranges for plasma aldosterone, renin and aldosterone/renin (a/r) ratio in south african normotensives under typical outpatient conditions, and to estimate the prevalence of primary aldosteronism (pa) among hypertensives in primary care settings. Plasma renin ≤0. 3 pmol/ml/hr (ref. May be normal or high. Confirmation of primary hyperaldosteronism.