![]() ![]() You will use the container to collect your urine. Your doctor will give you a large container that holds about 4 L (1 gal). You collect your urine for a period of time, such as over 4 or 24 hours. A single urine sample (clean catch) may be taken at a health professional's office or at home. Urine sodium can be checked in a single urine sample, but it is more often measured in a 24-hour urine sample. Low urine sodium levels have many causes, such as heart failure, malnutrition, and diarrhea. Urine sodium levels are affected by medicines and hormones. The urine sodium level is often low when blood levels are high. Urine sodium levels are often high when blood levels are low. Many medicines and other products also have sodium in them, including laxatives, aspirin, mouthwash, and toothpaste.ĭoctors may look at sodium levels in the blood and urine to see whether conditions or medicines may be causing fluid or electrolyte imbalances. Sodium is found in table salt as sodium chloride and in baking soda as sodium bicarbonate. ![]() Most foods have sodium naturally in them or as an ingredient in cooking. Small amounts of sodium are also lost through the skin when you sweat. Aldosterone levels tell the kidneys when to hold sodium in the body instead of passing it in the urine. Sodium levels in the body are partly controlled by a hormone called aldosterone, which is made by the adrenal glands. Most of the sodium in the body (about 85%) is found in blood and lymph fluid. Sodium is also important in how nerves and muscles work. It helps keep the water (the amount of fluid inside and outside the body's cells) and electrolyte balance of the body. Sodium is both an electrolyte and a mineral. A test for sodium in the urine is a 24-hour test or a one-time (spot) test that checks for how much sodium is in the urine. ![]()
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