I could not find reference to any hormone test in the paper by Morris in Nature Genetics paper on-line publication or the British Heart Foundation news item.
I believe the simple test suggested in the newspapers would be renin concentration (as published elsewhere by M Brown) but in the context of diagnosis of primary aldosteronism there are issues in measuring accurately low concentrations. Ideally an aldosterone/renin ratio should be determined so two tests are required and interpretation should be confined to centres with experience of the particular condition. It is dangerous to take literature quoted reference numbers without being clear of the units used for both hormone determinations. The ratio is influenced by a number of drugs likely to be prescribed to a patient with resistant hypertension.
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