• Test Code - PL0356
  • Test Name - Sodium
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Test Details & Preparation


  • Sodium blood and urine test is done to determine whether your sodium concentration is within normal limits and to help evaluate electrolyte balance and kidney function to monitor chronic or acute hypernatremia or hyponatremia.

  • Sodium blood and urine test is performed if you are experiencing dehydration or edema also to monitor certain chronic conditions, like high or low blood pressure.

  • A blood sample drawn from a vein in the arm or, in some cases, a 24-hour urine sample.

  • No test preparation is required for a sodium blood and urine test.

  • A low level of blood sodium is usually due to loss of too much sodium, too much water intake or retention, or to excess fluid accumulation in the body (edema).

  • If the sodium level falls quickly, the person may feel weak and fatigued in severe cases, he may experience confusion or even fall into a coma.

  • When the sodium level falls slowly, however, there may be no symptoms. That is why sodium levels are often checked even if someone has no symptoms.

  • A high blood sodium level is almost always due to inadequate water intake and dehydration. Symptoms include dry mucous membranes, thirst, agitation, restlessness, acting irrationally, and coma or convulsions if the sodium level rises to extremely high concentrations.


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