ALDOSTERONE/DIRECT RENIN RATIO

What this test checks

Calculates the ratio of aldosterone to renin — high ratios suggest primary aldosteronism.

Why do people get this test?

Key screening test for treatable causes of high BP.

When you should consider this test

• Hard-to-control BP
• Young person with hypertension
• Low potassium with high BP

How to prepare

Morning sample, upright for 2 hours.