Mediki
Calcium blood test: what your result means
Calcium measures a mineral needed for bones, muscle contraction, nerve signaling, and clotting.
- Standard unit
- mmol/L
- Reported in
- mmol/L, µmol/L, mEq/L, mg/dL, mg/100mL, mg% and more
What does high calcium mean?
Higher values may suggest increased calcium release or altered regulation. What counts as high depends on the reference range printed on your lab report, because ranges differ between laboratories.
What does low calcium mean?
Lower values may suggest low calcium availability or regulation imbalance. What counts as low depends on the reference range printed on your lab report, because ranges differ between laboratories.
Calcium units and conversion
Mediki shows calcium 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 = 0.2495 mmol/L | 1 mmol/L = 4.008 mg/dL |
| mg/L, µg/mL | 1 mg/L = 0.02495 mmol/L | 1 mmol/L = 40.08 mg/L |
Convert a value from your report with the blood test unit converter.
Why track calcium over time?
A single calcium 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.
Following calcium as part of a panel? See the vitamin D and B12 tracker.
Track your calcium 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.