Serum or Plasma Aldosterone-to-renin ratio (qualitative or semi-quantitative screening)

Why Is This Test Ordered?

Your healthcare provider may recommend this test if you have symptoms like high blood pressure that doesn’t respond to medication, frequent urination, low blood pressure, or signs of mineral imbalances. It’s also used in patients with suspected conditions like primary aldosteronism (Conn’s syndrome) or hyperaldosteronism.

What Does the Test Measure?

The test compares aldosterone levels (a hormone that promotes sodium retention and potassium excretion) to renin levels (an enzyme that signals the kidneys to retain sodium and excrete potassium). A higher aldosterone-to-renin ratio may suggest overactive aldosterone production, while a lower ratio might indicate insufficient renin activity.

How Is the Test Performed?

A blood sample is drawn from a vein in your arm. The sample is sent to a lab where aldosterone and renin are measured using specialized immunoassay techniques. Results are qualitative (yes/no) or semi-quantitative (approximate levels), meaning they indicate trends rather than exact values.

What Do the Results Mean?

Results help determine if your body’s hormone system is functioning normally. Elevated ratios may point to conditions like primary aldosteronism, while normal or low ratios may suggest other causes of symptoms. Follow-up testing or further evaluation by a specialist may be needed.