REN and primary aldosteronism: Aldosterone was 380 pmol/L (normal range 90-700), renin activity 5.2 nmol/L/hr (elevated relative to reference 0.5-3.5), giving an aldosterone/renin ratio of 73 (<80: not consistent with primary aldosteronism) (aldosterone blood test was taken in the lying position, and the patient was on his regular losartan for hypertension at that time).