Blood count
What do high or low MCV mean?
Educational guide only — not medical advice. Always review results with a qualified clinician.
MCV (mean cell volume) shows the average size of red blood cells. Low MCV often relates to iron deficiency or anaemia of chronic disease; high MCV may relate to B12 or folate deficiency—neither is a diagnosis on its own. Haemoglobin, ferritin, B12, and folate are interpreted together by your doctor.
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This article is educational and should be reviewed alongside our medical review, methodology, and transparency pages. Use it to prepare for a clinician conversation, not as a diagnosis.
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Blood count
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