Many conditions can affect sodium levels. A value that isn't in the normal range may still be normal for you. Your doctor will also look at your results based on your age, health, and other factors. Your lab report should show the range that your lab uses for each test. Other electrolytes, such as potassium, calcium, chloride, magnesium, and phosphate, may be checked in a blood sample at the same time as a blood test for sodium.Įach lab has a different range for what's normal. Low sodium levels have many causes, such as heart failure, malnutrition, and diarrhea. Many medicines and other products also have sodium in them, including laxatives, aspirin, mouthwash, and toothpaste. 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 mineral. A sodium test checks how much sodium is in the blood.
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