Corrected Magnesium Calculator

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Select the unit your lab reports for serum magnesium. US labs typically use mg/dL; European labs often use mmol/L.
The total serum magnesium value from the lab report. The normal range in mg/dL is 1.7 to 2.4.
mg/dL
Select the unit used for serum albumin. Most labs report in g/L; some US labs use g/dL. Normal albumin is 3.5 to 5.0 g/dL (35 to 50 g/L).
The patient's measured serum albumin. The normal value is 35 to 50 g/L (3.5 to 5.0 g/dL). Values below 35 g/L indicate hypoalbuminemia.
g/L
Corrected magnesium (mg/dL)Mild hypomagnesemia
1.47mg/dL

Albumin-adjusted serum magnesium in mg/dL

Corrected magnesium (mmol/L)0.607mmol/L
Corrected magnesium (mEq/L)1.21mEq/L
Correction added0.08mg/dL
Measured magnesium (mg/dL)1.4mg/dL
1.47 mg/dL
Severe hypo<0.7Moderate hypo0.7-1.2Mild hypo1.2-1.7Normal1.7-2.4Hypermagnesemia2.4+

Corrected magnesium is 1.47 mg/dL (0.607 mmol/L): mild hypomagnesemia.

  • Albumin is 25.0 g/L, which is below the normal threshold of 35 g/L. The correction added 0.07 mg/dL to the measured value of 1.40 mg/dL.
  • About 30% of serum magnesium is protein-bound (mainly to albumin). The other 70% is free ionized magnesium, which is the biologically active form.

Next stepConfirm with an ionized magnesium assay if available, and evaluate for symptoms such as muscle cramps, arrhythmia, and neuromuscular irritability. Clinical management of hypomagnesemia depends on severity and underlying cause.

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