Haemoglobin, your oxygen carrier
The part of your red cells that carries oxygen around your body.
Also printed asHemoglobin · Hb · Hgb
What it measures
The iron-containing protein inside red cells that binds oxygen in the lungs and releases it in tissue.
Sets how much oxygen reaches your muscles and brain, which shows up as stamina, breathlessness and concentration.
Why it matters for how long you stay well
Low haemoglobin is very common in India, especially in women, and it quietly caps how much exercise you can do, which is one of the strongest levers on how long you stay strong.
How it shows up in daily life
When it is low, running gets harder, stairs leave you breathless, and you may feel cold, pale and washed out for no clear reason.
High and low readings
When it reads high
Often concentration from dehydration, or from smoking or altitude.
When it reads low
Less oxygen reaches your tissues; tiredness and breathlessness follow.
What moves it
Daily life
- iron from meat, dal, green leafy vegetables and jaggery
- vitamin C with meals, which helps iron in
- tea and coffee with meals, which block iron
- heavy periods
- blood loss from the gut
Medicines known to shift it
- iron supplements (raise it when iron was low)
- NSAIDs (can lower it by causing bleeding in the gut)
- PPIs (can lower it by reducing iron absorption)
Listed so a result can be read in context. It is not advice to start, stop or change any medicine; that decision belongs with your physician.
Read it with
Markers that move this one, or that this one moves. One number read alone can mislead.
- Three-month sugar averageKnown mechanism
As this rises, Three-month sugar average can be misread because of it
The three-month average is measured on your red cells. When those cells are few or unusual, the average stops reflecting your sugar honestly.
- Ferritin, your iron storeKnown mechanism
Ferritin pushes it up
Iron is the raw material your body builds haemoglobin from. Stores empty first, and only once they are empty does haemoglobin start to fall.
- Packed cell volumeKnown mechanism
As this rises, Packed cell volume moves with it
Packed cell volume is simply the space those same red cells take up. So it rises and falls with haemoglobin, at roughly three times the number.
- Unprocessed bilirubinKnown mechanism
As this rises, Unprocessed bilirubin falls as it rises
When red cells break down faster than usual, two things happen at once. Haemoglobin falls, and the pigment released from those broken cells rises.
Common questions
What does Haemoglobin measure?
The iron-containing protein inside red cells that binds oxygen in the lungs and releases it in tissue. Sets how much oxygen reaches your muscles and brain, which shows up as stamina, breathlessness and concentration.
What does a high Haemoglobin result usually mean?
Often concentration from dehydration, or from smoking or altitude.
What does a low Haemoglobin result usually mean?
Less oxygen reaches your tissues; tiredness and breathlessness follow.
What is the usual reference range for Haemoglobin?
A broad adult reference band is 13–17 g/dL. For women the band is 12–15.5 g/dL. Labs differ, so read your result against the band printed on your own report.
Educational only, not a diagnosis. A single number means little without your history and the rest of your panel, so discuss your own results with your physician.
Typical adult reference band
- Men
- 13–17 g/dL
- Women
- 12–15.5 g/dL
Labs differ. The band printed on your own report is the one that applies to your result.
Reported in g/dL
Ageing relevance
3/5
A moderate ageing association; used in clinical longevity panels.
Indian reference data
Published data on this marker in Indian adults: Apollo Multicenter 2014 (PMC4062657); NFHS-5 anemia 57% women.
Worth knowing
Each red cell carries hundreds of millions of these oxygen-carrying molecules.
Have a report with this marker on it? Read it in context.
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