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Hypomagnesemia

  • Criteria

    • Mg < 1.5
  • Common ddx

    • EtOH, poor nutrition, cirrhosis, pancreatitis, correction of DKA, NG suction, diarrhea
  • Tx

    • Mg sulfate
    • monitor DTRs q15min
    • replete K, Ca, PO4 prn
  • Ddx

    • decreased intake
      • poor nutrition
      • malabsorption (steatorrhea)
      • oral calcium
    • GI loss
      • NG suction
      • diarrhea
    • reditribution
      • hungry bone syndrome (s/p parathyroidectomy)
      • acute pancreatitis
      • correction of DKA
      • refeeding after starvation
      • MI
    • renal loss (urine Mg > 10)
      • hypercalciuria
        • hyperparathyroidism
        • vitamin D usage
        • malignancy
        • sarcoidosis
        • RTA
      • drugs
        • cisplatin
        • aminoglycosides
        • synthetic penicillin
      • diuresis
        • diuretics
        • volume expansion
      • interstitial nephritis
      • hyperaldosteronism
    • other
      • EtOH
      • lactation
      • burns

  • Print | Citations

    Disclaimer: MDHero Workups is for educational use only, and is not meant to replace the clinical judgement of a professional. We do not guarantee the accuracy of any information on this website.