Mediki
Magnesium blood test: what your result means
Magnesium measures a mineral involved in enzyme activity, nerve function, and muscle relaxation.
- Standard unit
- mmol/L
- Reported in
- mmol/L, µmol/L, mEq/L, mg/dL, mg/100mL, mg% and more
What does high magnesium mean?
Higher values may suggest reduced excretion or excess supplementation. What counts as high depends on the reference range printed on your lab report, because ranges differ between laboratories.
What does low magnesium mean?
Lower values may suggest poor intake, losses, or increased use. What counts as low depends on the reference range printed on your lab report, because ranges differ between laboratories.
Magnesium units and conversion
Mediki shows magnesium in mmol/L. Labs may report it in other units; Mediki converts them automatically so results from different labs line up on one chart.
| Unit on your report | Convert to mmol/L | Convert back |
|---|---|---|
| µmol/L | 1 µmol/L = 0.001 mmol/L | 1 mmol/L = 1,000 µmol/L |
| mEq/L | 1 mEq/L = 0.5 mmol/L | 1 mmol/L = 2 mEq/L |
| mg/dL, mg/100mL, mg% | 1 mg/dL = 0.4114 mmol/L | 1 mmol/L = 2.43 mg/dL |
| mg/L, µg/mL | 1 mg/L = 0.04114 mmol/L | 1 mmol/L = 24.3 mg/L |
Convert a value from your report with the blood test unit converter.
Why track magnesium over time?
A single magnesium result is a snapshot. Comparing it with your earlier tests shows whether a value is stable, slowly drifting, or responding to a change in treatment or lifestyle, which is often more useful than one number on its own.
Read our guide on how to read blood test results to understand reference ranges, flags and units.
Track your magnesium results in one chart
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Medical disclaimer: This page is general information, not medical advice. Reference ranges differ between laboratories, and only a doctor can interpret your results in the context of your health.