MCV 78 fL — what does it mean?
Average red cell size
- What most labs call normal
- 80–100 fL
- Where you actually want to sit
- 82–92 fL
What this test is
The average size of your red blood cells.
What your number means
82–92 is the sweet spot. Under 80, cells are coming out small, which nearly always means low iron. Over 95, they’re coming out oversized and half-finished, which nearly always means low B12 or folate. Both directions point at the same thing: your marrow is short of something.
Why it matters
Cell size is a clue to whether your blood factory has the right raw materials to build cells properly.
When your marrow has the right supplies, red cells roll off the line a nice medium size. Run low on iron and they come out shrunken; run low on B12 or folate and they come out oversized and half-finished because the cell couldn’t copy its DNA in time to divide.
What to do about it
If your number is low, ask for an iron check (ferritin). If it’s high, check B12 and folate. Both shortfalls are usually fixable with food or a simple supplement.
Where it sits in your Body Age
MCV (Mean Corpuscular Volume) is one of the tests behind Blood Renewal — How cleanly your body is building fresh blood cells, day after day. It is one of four areas that together give a single number: the age your body reads, next to the age on your birth certificate.
This page explains what a blood test measures. It is not a medical diagnosis and cannot tell you what your own result means for you — take that to a doctor.