RENIN DIRECT, PLASMA

What this test checks

Measures renin, paired with aldosterone for evaluation of secondary high blood pressure.

Why do people get this test?

Part of the work-up for unusual high blood pressure causes.

When you should consider this test

• Hard-to-control hypertension
• Suspected adrenal or kidney cause
• Specialist requested

How to prepare

Morning sample, upright for 2 hours.