Good to knowOne result rarely tells the whole story. Your provider looks at your results together with your symptoms, exam, and other tests.
What the test is
Many blood pressure medicines affect results; your provider may adjust them before testing.
Why it's done
- High blood pressure that's hard to control
- High blood pressure with low potassium
- High blood pressure at a young age
Getting ready and what happens
- Test in the morning after being up for 2 hours, then seated for 5 to 15 minutes.
- Don't stop medicines on your own; ask first.
How the test is done
- A health worker cleans the skin, puts a band around your arm, and draws blood from a vein with a small needle. It takes a few minutes.
What the results mean
High ratio
Suggests primary aldosteronism. More tests confirm it and find the source.
Questions to ask your provider
- What do my results mean for me?
- Do I need to repeat this test or have other tests?
Risks
A blood draw is very safe. You may have slight pain or a small bruise where the needle went in.
Related conditions
Related medicines
Related tests
Sources
Last updated 2026-11-13.