ALDOSTERONE, PLASMA

What this test checks

Measures aldosterone, the hormone that controls salt retention and blood pressure.

Why do people get this test?

Used in evaluating hard-to-control high blood pressure.

When you should consider this test

• Hard-to-control blood pressure
• Low potassium with high BP
• Specialist requested

How to prepare

Morning sample; you'll need to be upright for 2 hours before sampling.