Renin Test
Reviewed
This test measures the level of renin in your blood. Renin is an enzyme made by your kidneys that helps control your blood pressure. It is often done together with an aldosterone test to diagnose adrenal gland disorders, especially primary aldosteronism (PA).
Preparation and collection
You may be asked to stop taking certain medicines before your test, so tell your health care provider about everything you take. But don't stop taking any medicines unless your provider tells you to. Some medicines that may affect the results of your test can include: birth control pills, blood pressure medicines, diuretics (water pills). You may also be asked to limit the amount of salt you eat each day before your test. Your provider will explain how to do this and for how long. You should not eat natural black licorice for at least two weeks before your test.
Understanding this test
Use the reference interval and units printed by the laboratory that performed the test. A result outside that interval is not a diagnosis by itself, and a result inside it does not rule out every condition. Your symptoms, history, medicines, timing, and related tests can change what the result means.
- There is very little risk to having a blood test. There may be slight pain or bruising at the spot where the needle was put in, but most symptoms go away quickly.
- Your position (sitting, standing, etc.), stress level, and certain medicines can affect your renin and aldosterone levels.
- You should not eat natural black licorice for at least two weeks before your test, because it can affect your results.
What to do next
Depending on your results, your provider may recommend medicines and/or diet and lifestyle changes to treat your condition. If you have questions about your results, talk to your provider.