This system is activated when the body experiences a decrease in blood flow to the kidneys, such as after a drop in blood pressure, or a significant drop in blood volume after a hemorrhage or serious injury. Renin is responsible for the production of angiotensin, which then causes the release of aldosterone.

Where is aldosterone secreted from when will it be secreted?

Aldosterone is a steroid hormone synthesized in and secreted from the outer layer of the adrenal cortex, the zona glomerulosa. Aldosterone is responsible for regulating sodium homeostasis, thereby helping to control blood volume and blood pressure.

What time of day is aldosterone highest?

Aldosterone levels are highest in the morning, so you may need to have the test in the morning after you've been awake and moving around for about 2 hours. Ask your healthcare provider if you have any food restrictions and if you need to stop taking your medicine before the test.