Plasma aldosterone / renin activity ratio
Aldosterone-to-renin ratio (ARR) is the mass concentration of aldosterone divided by the plasma renin activity in blood plasma. The aldosterone/renin ratio is recommended as screening tool for primary hyperaldosteronism.[1]
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francesco.carlomagno commented
You could easiliy implement your app with the aldosterone-renin-ratio, the first step in the diagnosis of hyperaldosteronism.
The following app does a nice job, but I would prefer using just MedCalc: https://itunes.apple.com/it/app/arr-aldosterone-renin-ratio/id1050970541?mt=8Also please include the cut-off of the Endocrine Society, which the previoua referred app is missing.