Aldosterone Blood Test
Woman in medical attire with a stethoscope on a pink background, featuring text about a medical team being ready to help.
Aldosterone Blood Test
Aldosterone Blood Test
Aldosterone Blood Test
Aldosterone Blood Test
Aldosterone Blood Test
Woman in medical attire with a stethoscope on a pink background, featuring text about a medical team being ready to help.
Aldosterone Blood Test
Aldosterone Blood Test
Aldosterone Blood Test
Aldosterone Blood Test

Over 250k Biomarkers Tested

Aldosterone Blood Test

$58.00 AUD

Struggling to control your blood pressure despite medication, or been told your potassium keeps running low?

Measures aldosterone, the adrenal hormone that regulates sodium retention, potassium excretion and blood pressure. Used to investigate difficult-to-control hypertension, unexplained low potassium and suspected primary hyperaldosteronism (Conn's syndrome). Frequently ordered alongside renin.

Collection Location
Specimen Type

You will be emailed a referral to take to your local collection centre. If you ever have any questions, we're here to help.

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How It Works

Getting your health measured shouldn't be hard! We're here to help you every step of the way.

1
Order a test

Order a test

Order the private test that suits you and your goals. After ordering, you will receive your referral by email.

2
Collect the sample

Collect the sample

Attend one of our 4000+ partner collection centres throughout Australia. Search locations.

3
Receive your results

Receive your results

View all your lab results in your secure health dashboard. Easy!

Overview

Aldosterone regulates your body's salt and water balance. Produced by the adrenal glands, it instructs your kidneys to retain sodium and release potassium, directly affecting blood volume and blood pressure.

This blood test measures aldosterone levels to investigate resistant hypertension, unexplained electrolyte imbalances, and suspected adrenal disorders. Primary aldosteronism—where the adrenals produce excess aldosterone independent of normal signals—causes an estimated 5-10% of hypertension cases. Many people with this condition take multiple blood pressure medications without adequate control because the underlying hormonal cause goes unidentified.

The test is particularly valuable for Australians whose blood pressure responds poorly to standard treatment, who have low potassium without clear explanation, or who experience fatigue and muscle weakness alongside elevated blood pressure.

Symptoms

To assess adrenal mineralocorticoid function, investigate difficult-to-control hypertension, screen for primary hyperaldosteronism (Conn's syndrome), and evaluate unexplained hypokalaemia.

Questions

  • Aldosterone and renin work together in the renin-angiotensin-aldosterone system (RAAS). The ratio between them is more informative than either alone. A high aldosterone with a low renin is the classic pattern of primary hyperaldosteronism (Conn's syndrome).
  • Yes, significantly. Spironolactone, eplerenone, ACE inhibitors, ARBs, beta-blockers, diuretics, and some blood pressure medications all affect aldosterone and renin levels. Discuss with your practitioner whether to pause any medications before testing, and never stop medication without medical advice.
  • Fasting is not strictly required, but you should avoid excessive salt intake in the days before the test. Follow any instructions provided by your practitioner.
  • Conn's syndrome is primary hyperaldosteronism caused by a benign adrenal tumour (adenoma) that produces excess aldosterone independently of normal regulation. It typically causes high blood pressure and low potassium, and is often curable with surgery or manageable with targeted medication.
  • Yes. Low aldosterone can occur in adrenal insufficiency (Addison's disease) or with certain enzyme deficiencies. It causes low blood pressure, high potassium, and salt cravings. Your practitioner will interpret a low result in the context of your symptoms and other test results.

Dr. Vu Tran
Bloody Good’s Chief Medical Officer

Biomarker Tested

How to prepare

Your practitioner or the ordering clinician may give specific instructions about medication, diet, and posture before this test. Some medications (including spironolactone, ACE inhibitors, and beta-blockers) can significantly affect aldosterone results and may need to be paused. Do not stop any medication without discussing this with your practitioner first. Maintaining a normal sodium intake in the days leading up to the test is generally recommended. Collection is often done in the morning after sitting quietly for 15–30 minutes.

After the test

Aldosterone results are almost always interpreted alongside renin. If both are ordered, your practitioner will calculate the ratio. An abnormal aldosterone:renin ratio may prompt further investigation including imaging of the adrenal glands. Adrenal conditions that cause excess aldosterone are often surgically or medically treatable.

Your test results will be available in your private dashboard. If there are any urgent issues, we'll let you know so you can follow up with your health professional.

Understanding results

Aldosterone is measured in picomoles per litre (pmol/L) and reference ranges vary by posture (seated versus standing) and laboratory. Results are most meaningful when interpreted alongside renin and potassium levels.

- Aldosterone:renin ratio (ARR): The key calculation for screening primary hyperaldosteronism. An elevated ARR with a high aldosterone level is strongly suggestive.
- Low aldosterone: Can indicate adrenal insufficiency or secondary causes where adrenal signalling is suppressed.

Because posture, medications, salt intake, and time of day all affect results, interpretation requires clinical context. Your results should be reviewed by a practitioner with access to your medication history.

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Frequently Asked Questions

Most collection centres accept walk-ins. Some may require a booking - check details when you click on your chosen location.

If your test needs fasting, we’ll include that in your instructions after you order. Fasting usually means no food for 8–12 hours, but water is fine.

Just your pathology referral form (we email it to you)

Of course. Just maybe don’t bring the friend who faints at the sight of blood.

They’re the highly trained professionals who take your blood sample - with a steady hand and a sharp needle. They love blood, but don’t worry… they’re not vampires. Just legends who make blood tests quick, clean, and (almost) painless.

Some of our tests include Urine, Stool, Saliva and more. Each test will have a clear description on what sample you will need to give and instructions on how.