Mediki
Hemoglobin blood test: what your result means
Hemoglobin measures the oxygen-carrying protein inside red blood cells. It reflects how well blood can deliver oxygen.
- Category
- Complete blood count
- Standard unit
- g/L
- Reported in
- g/L, mg/mL, g/dL, g%, g/100mL, mmol/L
What does high hemoglobin mean?
Higher values may suggest dehydration or increased red cell mass. What counts as high depends on the reference range printed on your lab report, because ranges differ between laboratories.
What does low hemoglobin mean?
Lower values may suggest anemia or blood loss. What counts as low depends on the reference range printed on your lab report, because ranges differ between laboratories.
Hemoglobin units and conversion
Mediki shows hemoglobin in g/L. Labs may report it in other units; Mediki converts them automatically so results from different labs line up on one chart.
mg/mL is numerically the same as g/L, so no conversion is needed.
| Unit on your report | Convert to g/L | Convert back |
|---|---|---|
| g/dL, g%, g/100mL | 1 g/dL = 10 g/L | 1 g/L = 0.1 g/dL |
| mmol/L | 1 mmol/L = 16.11 g/L | 1 g/L = 0.06206 mmol/L |
Convert a value from your report with the blood test unit converter.
Why track hemoglobin over time?
A single hemoglobin 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 hemoglobin as part of a panel? See the ferritin and iron tracker.
Track your hemoglobin 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.