Blood count
Hemoglobin
LOINC 718-7 · g/dL
What it is
Hemoglobin is the protein in red blood cells that carries oxygen from your lungs to the rest of your body.
Why it matters
It is the central measure of anemia and of your blood's oxygen-carrying capacity.
What high values can mean
A higher value can reflect dehydration, smoking, living at altitude or an overproduction of red cells.
What low values can mean
A lower value indicates anemia, commonly from iron, B12 or folate deficiency, blood loss or chronic disease.
How to improve it
Correcting the underlying cause — often iron or vitamin levels — is what restores hemoglobin.
Food & lifestyle
Iron-rich foods with vitamin C to aid absorption, plus adequate B12 and folate, support healthy hemoglobin.
Preparing for the test
Part of a complete blood count (CBC); fasting is not required.
When to talk to a doctor
Discuss low hemoglobin with a doctor, especially with fatigue, pallor, breathlessness or a fast heartbeat.
Related markers
Sources
- MedlinePlus (NIH)
- Testing.com (AACC)
Content reviewed on June 26, 2026
Medical disclaimer
This content is for educational purposes only. It is not medical advice and does not diagnose, treat, or prevent any condition. Reference ranges vary between laboratories — always use the range printed on your report and discuss your results with a healthcare professional.
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