For clinical reference only — does not replace local trust guidelines or clinical judgement.
‹ Blood Results
Blood Results

Hypomagnesaemia

Hypomagnesaemia

Severity
Range
  • Mild
    Mg 0.50–0.69
  • Moderate
    Mg 0.40–0.49
  • Severe
    Mg < 0.40 or symptomatic
🚽

GI losses Causes

DiarrhoeaMalabsorption (coeliac, IBD, short bowel)Vomiting / NG suctionPPI long-term
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Renal losses Causes

Loop / thiazide diureticsAminoglycosides, amphotericin, cisplatinCiclosporin / tacrolimusAlcoholHypercalcaemia
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Reduced intake Causes

AlcoholismMalnutritionRefeeding syndromeTPN without supplementation
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Other Causes

DKA recoveryAcute pancreatitisGitelman syndrome