Lab marker · Low

Low Magnesium: what it means

A Magnesium result below the normal range is considered low. Here is what a reduced Magnesium can point to, and when it is worth discussing with a doctor.

Reference range: 1.7–2.2 mg/dL; serum level underestimates total body magnesium

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What a low Magnesium can mean

  • Gastrointestinal loss — chronic diarrhoea, malabsorption, proton-pump inhibitor use, gastric bypass.
  • Renal loss — diuretics (loop and thiazide), alcohol, aminoglycoside antibiotics, cisplatin.
  • Reduced intake — alcoholism, refeeding syndrome.
  • Hypoparathyroidism, diabetes.
  • Look for low magnesium whenever low potassium or calcium is refractory to replacement.

When to discuss with a doctor

Symptoms of magnesium deficiency — muscle cramps, tremor, palpitations, refractory hypokalaemia — combined with a borderline-low serum level warrant a primary-care work-up. Patients on long-term PPI, diuretic or alcohol use benefit from periodic magnesium screening. Severe hypomagnesaemia with neurological symptoms is treated with IV replacement.

Conditions this can relate to

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Mediora.AI is informational - interpretation, not a diagnosis. A single out-of-range value is common and often benign; always discuss decisions with your doctor.