MCV — The Average Size of Your Red Blood Cells
Mean corpuscular volume measures the average size of your red blood cells, reported as part of a complete blood count and read alongside the rest of the panel.
Mean corpuscular volume, or MCV, measures the average size of your red blood cells, and is usually reported as part of a complete blood count rather than ordered on its own.
The biomarker
- Name: Mean Corpuscular Volume (MCV)
- Units: fL
- Standard range: about 80 to 100 fL for adults (ranges vary by lab).
How to read your result
| Pattern | What it can mean |
|---|---|
| Low | A value below your lab range means the cells are smaller than usual and needs clinical interpretation with the rest of the blood count. |
| High | A value above your lab range means the cells are larger than usual and needs clinical interpretation with the rest of the blood count. |
| Normal | Within the laboratory range printed on your own report. |
| Context | Labs use slightly different ranges, so compare your value with the range printed on your own report. |
What moves the needle
- Do not start or stop any supplement or medicine on the strength of one value — ask your clinician first.
- If flagged, ask whether the test should be repeated and which related blood tests belong with it.
- No special preparation is needed for a complete blood count.
- Tell the clinician every medicine and supplement you take, since some can affect blood cell size.
Why this test is worth asking for
- It is usually included automatically whenever a complete blood count is ordered, so there is rarely a reason to request it separately.
- Read alongside the rest of the blood count, it helps a clinician narrow down the likely cause of an abnormal red cell result.
Sources
AgeGen lab guides are educational only. We do not provide medical diagnosis, prescribe brands, or recommend specific doses. Talk to a licensed clinician before changing your supplement or medication routine.
