Renin Test Test

The renin test measures the level of renin in your blood. Renin is an enzyme made by your kidneys that helps control blood pressure by regulating another hormone called aldosterone. This test is often used to diagnose conditions related to your adrenal glands, especially primary aldosteronism (too much aldosterone).

What this test measures

This test measures the level of renin in your blood. Renin is an enzyme made by your kidneys that helps control blood pressure and the production of aldosterone.

What your results mean

Reference ranges vary by laboratory and by your age and sex. MedlinePlus does not publish a single normal range for this test — always read your result against the range printed on your own lab report and discuss it with your provider.

Higher-than-normal results

According to MedlinePlus, a higher-than-normal amount of renin may be a sign of Addison disease, cirrhosis, or dehydration.

Lower-than-normal results

According to MedlinePlus, a lower-than-normal amount of renin may be a sign of primary aldosteronism or kidney disease.

Frequently asked questions

What is renin?

Renin is an enzyme made by your kidneys that helps control blood pressure and the production of aldosterone.

Why is this test done?

The test is used to find out if your adrenal glands are making too much or too little aldosterone, and to diagnose primary aldosteronism.

How are renin and aldosterone related?

Renin controls the production of aldosterone. Usually, if renin increases or decreases, aldosterone does the same.

What can affect renin levels?

Your position (sitting, standing), stress level, certain medicines, and time of day can affect renin and aldosterone levels.

What does a high renin level mean?

A higher-than-normal renin level may be a sign of Addison disease, cirrhosis, or dehydration.

Sources

MedlinePlus: Renin Test — NIH MedlinePlus

Last updated July 7, 2026. Information is aggregated from official public sources and is not a substitute for professional medical care.