Aldosterone test
Quick answer: An aldosterone test measures aldosterone, a hormone from the adrenal glands that controls salt, potassium and blood pressure. It is ordered for high blood pressure that is hard to control or comes with low potassium, often together with a renin test.
- SampleBlood
- TakesAbout 5 to 10 minutes, longer if you need to sit or walk first
- Before the testYour doctor may give instructions on timing, posture and salt intake; tell staff about all medicines, as many affect the result.
How the test is done
- 1Your doctor may ask you to stay upright for a while before the blood draw
- 2Blood is drawn, often in the morning
- 3Renin is usually measured from the same sample
- 4The lab works out an aldosterone to renin ratio
What your results can mean
Reading your report
Aldosterone is usually read with renin as a ratio; discuss your result with your doctor.
If the result is outside the usual range
High aldosterone with low renin can point to primary aldosteronism, a cause of high blood pressure and low potassium. Low aldosterone can be seen with Addison's disease or some other adrenal problems.
Who usually has this test
People with high blood pressure that is hard to control, low potassium, or high blood pressure at a young age.
Risks and aftercare
Bruising is possible; take your medicines as your doctor has directed.
Names and options
Also called: serum aldosterone, aldosterone renin ratio
Listed by the hospital as
- ALDOSTERONE, SERUM
Questions about this test
Do blood pressure medicines affect the result?
Some medicines affect the result, but never stop or change them on your own. Your doctor will tell you if any change is needed and how to make it safely.
What is the aldosterone to renin ratio?
It compares aldosterone with renin, a related kidney hormone. A high ratio can suggest the adrenal glands are making too much aldosterone.
Does salt intake matter before the test?
Yes, very low or very high salt intake can change aldosterone levels. Eat your usual diet unless your doctor advises otherwise.
Related tests
Tamara Hospital & IVF Centre, Rajajinagar
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This page explains each test in general terms so you know what to expect. It is not medical advice: your doctor decides which tests you need and what your results mean. Reference ranges differ between laboratories. Updated 4 November 2026.