You are in Medical Library . Aldosterone is a steroid hormone that plays a major role in regulating potassium levels within the body.
Aldosterone increases the loss of potassium in the kidneys.
A 24-hour urine sample is needed. The health care provider will instruct you, if necessary, to discontinue drugs that may interfere with the test. On day 1, urinate into the toilet upon arising in the morning. On day 2, urinate into the container in the morning upon arising. Cap the container.