Primary hyperaldosteronism laboratory findings

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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]

Laboratory Findings

There is metabolic alkalosis (due to increased secretion of H+ ions by the kidney). The high pH of the blood makes calcium less available to the tissues leading to hypocalcemia.

Measuring aldosterone alone is not considered adequate to diagnose Conn's syndrome. Rather, both renin and aldosterone are measured, and the ratio is diagnostic.

Usually, renin levels are suppressed, leading to a very low renin-aldosterone ratio (<0.0005). This test is confounded by antihypertensive drugs, which have to be stopped up to 6 weeks.