Sodium - urineFrom our partner site on incontinence, IncontinenceNetwork.com. The test involves only normal urination, and there is no discomfort. Why the test is performed: The test is often used to determine hydration status and the kidney's ability to conserve or excrete sodium. Aldosterone (see the aldosterone test), a hormone produced by the adrenal gland, plays a major role in regulating sodium levels within the body and urine. Specifically, aldosterone increases the reabsorption of sodium in the kidneys at the expense of potassium and hydrogen loss. Reabsorption of sodium helps retain water in body tissues and the blood stream. This way, aldosterone helps maintain plasma volume and blood pressure. Dehydration and conditions that decrease kidney blood flow stimulate aldosterone production.
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