Mediki
Potassium blood test: what your result means
Potassium measures an electrolyte important for heart rhythm, muscle function, and nerve signaling.
- Standard unit
- mmol/L
- Reported in
- mmol/L, mEq/L
What does high potassium mean?
Higher values may suggest impaired excretion or cell-shift effects. What counts as high depends on the reference range printed on your lab report, because ranges differ between laboratories.
What does low potassium mean?
Lower values may suggest risk of muscle weakness or rhythm instability. What counts as low depends on the reference range printed on your lab report, because ranges differ between laboratories.
Potassium units and conversion
Mediki shows potassium 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 potassium over time?
A single potassium 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 potassium 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.