• Test Code - PL0124
  • Test Name - Magnesium
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Test Details & Preparation


  • Magnesium test is done to evaluate the level of magnesium in the blood and to help determine the cause of abnormal levels of magnesium, calcium or potassium.

  • Magnesium test is performed when you have symptoms such as weakness, irritability, cardiac arrhythmia, nausea, or diarrhoea that may be due to too much or too little magnesium when you have abnormal calcium or potassium levels.

  • A blood sample drawn from a vein in your arm sometimes a timed urine collection that most often requires a 24-hour sample for a Magnesium test.

  • For a blood sample, overnight fasting may be required follow any instructions that you are given.

  • Low blood levels of magnesium may indicate that a person is not consuming or absorbing enough magnesium or is excreting too much.

  • Increased blood levels of magnesium are rarely due to dietary sources but are usually the result of an excretion problem or excessive supplementation.

  • Since magnesium is an electrolyte, a magnesium test may be ordered along with other electrolytes such as sodium, potassium, chloride, bicarbonate (or total CO2), calcium, and phosphorus to evaluate a person's electrolyte balance. If magnesium is low, it is not unusual for potassium also to be low.


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