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The 24-hour urinary aldosterone excretion rate test measures the amount of aldosterone removed in the urine in a day. Aldosterone is a hormone released by the adrenal gland that helps the kidney control salt and potassium balance.
See also: Blood aldosterone test
Aldosterone - urine
A 24-hour urine sample is needed.
For an infant, thoroughly wash the area around the urethra. Open a urine collection bag (a plastic bag with an adhesive paper on one end), and place it on the infant. For males, place the entire penis in the bag and attach the adhesive to the skin. For females, place the bag over the labia. Diaper as usual over the secured bag.
This procedure may take a couple of attempts -- lively infants can move the bag, causing the urine to be absorbed by the diaper. Check the infant frequently and change the bag after the infant has urinated into it. Drain the urine from the bag into the container provided by your health care provider.
Deliver it to the laboratory or your health care provider as soon as possible upon completion.
Your health care provider may tell you to stop taking drugs that may interfere with the test.
Other factors that can affect aldosterone measurements include:
Avoid coffee, tea, and cola during urine collection. Your health care provider will usually recommend that you eat no more than 3 grams of salt (sodium) per day for at least 2 weeks before the test.
The test involves only normal urination, and there is no discomfort.
The test is done to see how much aldosterone is released into your urine.
Results depend on:
Normal values vary from lab to lab. Talk to your doctor about your specific test results.
Greater than normal levels of aldosterone may be due to:
Lower than normal levels may indicate Addison's disease.
There are no risks.
Young Jr WF. Endocrine hypertension. In: Melmed S, Polonsky KS, Larsen PR, Kronenberg HM, eds. Williams Textbook of Endocrinology. 12th ed. Philadelphia, Pa: Saunders Elsevier; 2011:chap 16.