Mediki
Sodium blood test: what your result means
Sodium measures a key electrolyte that regulates fluid balance and nerve signaling.
- Standard unit
- mmol/L
- Reported in
- mmol/L, mEq/L
What does high sodium mean?
Higher values may suggest dehydration or concentrated sodium balance. What counts as high depends on the reference range printed on your lab report, because ranges differ between laboratories.
What does low sodium mean?
Lower values may suggest fluid imbalance or dilution states. What counts as low depends on the reference range printed on your lab report, because ranges differ between laboratories.
Sodium units and conversion
Mediki shows sodium in mmol/L. Labs may report it in other units; Mediki converts them automatically so results from different labs line up on one chart.
mEq/L is numerically the same as mmol/L, so no conversion is needed.
Why track sodium over time?
A single sodium 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 sodium 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.