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COMPLETE BLOOD COUNT (CBC)
Also printed as: Hgb · Hb · Haemoglobin
Educational only — not medical advice.
Hemoglobin is the iron-containing protein inside red blood cells that actually binds and carries oxygen. The test measures how much of it is in your blood. It is the number most often used to describe anemia.
Hemoglobin is the practical measure of oxygen-carrying capacity, which is why it connects so directly to energy and stamina. But it moves with hydration too, so trend and context matter more than a single value.
TYPICAL ADULT RANGE
Many labs report roughly 13.5–17.5 g/dL for adult men and 12.0–15.5 g/dL for adult women. Ranges vary by lab and by pregnancy status. Reported in g/dL.
Reference ranges vary by lab, by method, and by age and sex. Always read your own result against the range printed on your report.
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A lower hemoglobin has common, treatable-in-conversation-with-your-doctor causes: low iron stores are the most frequent, often from heavy menstrual periods, pregnancy, blood donation, or lower dietary iron. Low B12 or folate, recent illness, and being well hydrated at the draw also lower it. Endurance athletes commonly run slightly low from plasma expansion, which is a normal adaptation. If it is new for you, or comes with unusual fatigue or breathlessness, that is worth raising with your doctor, who will typically check ferritin and MCV next.
A high hemoglobin most often reflects less plasma rather than more red cells — dehydration at the draw is the usual explanation and resolves on a rehydrated repeat. Living at altitude, smoking, sleep apnea, and testosterone therapy raise it genuinely. Because testosterone therapy predictably increases it, people on TRT often have it monitored on a schedule. A persistently high value is a normal reason to discuss sleep, smoking, and medications with your doctor.
Your doctor is the one who can read this number against your history, symptoms, and medications.
Educational only — not medical advice. Lab results only mean something alongside your history, symptoms, medications, and the rest of your panel. Bring questions to your doctor; they are the one who can interpret your results for you.
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