Blood Sodium – Normal Range

The normal range for blood sodium is between 135 and 145 mEq/L (3.10 mg/ml to 3.34 mg/ml).

A sodium blood test is a routine test that allows your doctor to see how much sodium is in your blood. It’s also called a serum sodium test. Sodium is an essential mineral to your body. It’s also referred to as Na+.

If you are experiencing dehydration, problems with blood pressure, accumulating excess fluid (edema), or have non-specific symptoms, your doctor may order blood test to learn your sodium level.

A low level of blood sodium (hyponatremia) may be due to:

  • Losing too much sodium, most commonly from conditions such as diarrhea, vomiting, excessive sweating, use of diuretics, kidney disease or low levels of cortisol, aldosterone and sex hormones (Addison disease)
  • Drinking too much water as might occur during exercise
  • Excess fluid accumulation in the body (edema) caused by heart failure, cirrhosis, and kidney diseases that cause protein loss (nephrotic syndrome) or malnutrition. In a number of diseases, particularly those involving the brain and the lungs, many kinds of cancer, and with some drugs, the body makes too much anti-diuretic hormone (ADH), causing a person to keep too much water in the body.

Low blood sodium is rarely due to decreased sodium intake (deficient dietary intake or deficient sodium in IV fluids).

A high blood sodium level (hypernatremia) is almost always caused by losing too much water (dehydration) without drinking enough water. In rare cases, it may be due to increased salt intake without enough water, Cushing syndrome, or a condition caused by too little ADH called diabetes insipidus.


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