Aldosterone renin ratio

You should get an aldosterone renin ratio test if your blood pressure remains high despite three or more medicines, or if you have high blood pressure with low potassium, muscle weakness, or cramps. It is also recommended for hypertension before age 40, an adrenal mass, sleep apnea with hypertension, and a family history of early stroke.

Fasting is not required for an aldosterone renin ratio test. Give your sample mid-morning, after being awake and upright for about 2 hours, then seated for 5–15 minutes. Maintain normal salt intake, and have low potassium corrected beforehand. Some blood pressure medicines, especially spironolactone, may need adjusting, but only under your doctor’s guidance.

No, fasting is not required for an aldosterone renin ratio test. You can eat and drink normally and maintain your usual salt intake. More importantly, give your sample mid-morning after being upright for about 2 hours, and follow your doctor’s advice about any blood pressure medicines before the test.