Hypermagnesaemia
Severity
Range
- MildMg 1.05–1.99
- ModerateMg 2.0–3.49
- SevereMg ≥ 3.5 or symptomatic
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Renal Causes
AKI / CKD (reduced excretion)Dialysis with high-Mg dialysate
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Iatrogenic / drugs Causes
IV magnesium therapy (eclampsia, asthma, torsades)Mg-containing antacids / laxatives (Mg trisilicate, MgOH)Mg-containing enemasLithium toxicity
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GI / endocrine Causes
Addison's diseaseHypothyroidismFamilial hypocalciuric hypercalcaemia
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Cellular release Causes
Tumour lysis syndromeRhabdomyolysisMassive trauma / burns
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Other Causes
Pre-eclampsia treatment (MgSO₄ infusion)Theophylline toxicity