Home › Lab markers › MCV (Mean Corpuscular Volume)
COMPLETE BLOOD COUNT (CBC)
Also printed as: MCV · Mean cell volume
Educational only — not medical advice.
MCV is the average size of your red blood cells. It does not measure how many cells you have — only how big they are on average. That single detail is often what points toward the reason behind a change in hemoglobin.
MCV is the sorting marker of the CBC. Small cells and large cells suggest different directions to look, which is why doctors reach for it immediately when hemoglobin is off.
TYPICAL ADULT RANGE
Many labs report roughly 80–100 fL for adults. Ranges vary by lab. Reported in fL.
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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Smaller-than-average red cells most commonly accompany low iron stores, which is why ferritin is the usual next test. Inherited traits such as thalassemia trait also produce small cells and are compatible with a completely normal life — many people carry one without knowing. Chronic inflammation can contribute too. A low MCV is a clue, not a diagnosis, and pairs naturally with a ferritin check ordered by your doctor.
Larger-than-average red cells are commonly linked to lower B12 or folate levels, and to regular alcohol intake. Some medications raise MCV as an expected effect, as can lower thyroid activity, and a recent burst of new red cell production temporarily raises the average because young cells are bigger. It is a routine prompt for your doctor to check B12, folate, and thyroid — a straightforward set of follow-ups.
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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