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Test Findings


April 24th, 2019


  • Look For

  • Serum magnesium >1.1 mmol/L.


  • Causes of Hypermagnesaemia

  • Usually occurs in the setting of magnesium administration (e.g. supplements, antacids, enemas) in patients with renal failure.

Clinical Features

  • Signs and Symptoms

  • Occur only with severe hypermagnesaemia.
  • Nausea / vomiting
  • Drowsiness
  • Muscle weakness / hyporeflexia
  • Vasodilation / hypotension
  • Blurred vision / diplopia
  • ECG Changes

  • Hyperkalaemia - tented T waves, P wave flattening, prolonged PR, prolonged QRS, short QT
  • Associated Lab Abnormalities

  • Hyperkalaemia
  • Hypocalcaemia
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