Na Test: Normal Range

Na test is useful in determining whether your sodium level is within normal limits and evaluating electrolyte balance. Additionally, it can help determine the cause and monitor the treatment for illnesses associated with abnormal sodium levels in the body.

The normal range for blood sodium levels is 135 to 145 milliequivalents per liter (mEq/L), though the normal
value may vary slightly among different laboratories.

Low blood sodium is rarely due to decreased sodium intake, but it may be due to:

  • losing too much sodium because of diarrhea, vomiting, excessive sweating, kidney disease or low levels of cortisol, aldosterone and sex hormones
  • drinking too much water especially 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

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.

Keywords: Na, Sodium

* The Content is not intended to be a substitute for professional medical advice, diagnosis, or treatment. Always seek the advice of your physician or other qualified health provider with any questions you may have regarding a medical condition.