Definition
What MCV measures
Mean corpuscular volume is the average size of red blood cells. Size classifies anemia: small cells suggest one set of causes, large cells another.
Illustrative sample band · Synthetic
90fL
78Sample target 85–95 fL102
Why it matters
How clinicians usually read it
It is the first sorting tool when hemoglobin is low — small cells point toward iron shortfall, large cells toward B12/folate or alcohol effects — often before symptoms clarify.
When it reads low
A lower value can mean
Smaller cells most often reflect iron deficiency or an inherited hemoglobin trait. Iron studies on this panel usually sort the two.
When it reads high
A higher value can mean
Larger cells can follow B12 or folate shortfall, alcohol, thyroid conditions, or some medications. B12 on this panel covers the most actionable cause.
Questions for a clinician
Bring the number into a real conversation
01
Does my MCV pattern match my iron and B12 results?
02
Could alcohol intake or a medication explain a size shift?
03
Is a hemoglobin-variant test worth considering for small cells?
Educational boundary
Educational information only. Displayed ranges are illustrative sample bands, not a diagnosis, treatment plan, or substitute for the contracted laboratory report and a qualified clinician.
See it as a sample result
The sample dashboard shows an illustrative reading, target band, and trend for MCV.