Comparison CBC Updated Apr 17, 2026

Mean Corpuscular Volume vs Mean Corpuscular Hemoglobin

Mean Corpuscular Volume (MCV) and Mean Corpuscular Hemoglobin (MCH) are two CBC values that describe different parts of red blood cell composition. Both appear on the same complete blood count (CBC) panel and are often reviewed together on a lab report. MCV reflects red cell size, while MCH reflects the amount of hemoglobin in each cell, so the difference between MCV and MCH is about size versus content.

Mean Corpuscular Volume

MCV

Mean Corpuscular Volume (MCV) is the average size of red blood cells measured in a blood sample. On a lab report or blood test, MCV helps describe red cell size as part of a CBC and is often read with other red blood cell markers. It is a numerical summary, not a stand-alone conclusion, and is used to compare a person’s result with the Mean Corpuscular Volume normal range.

Adult Male fL
80
100

Mean Corpuscular Hemoglobin

MCH

Mean Corpuscular Hemoglobin (MCH) is the average amount of hemoglobin in each red blood cell, reported as part of the CBC and often abbreviated as MCH. On a blood test or lab report, it helps describe red blood cell composition alongside markers such as MCV, RBC, and hematocrit (Hct).

Adult Male pg
27
33.2

Mean Corpuscular Volume (MCV) and Mean Corpuscular Hemoglobin (MCH) are two CBC lab values that describe related parts of red blood cell makeup. MCV shows the average size of red blood cells, while MCH shows the average amount of hemoglobin in each red blood cell. Because both come from the same blood sample and same panel, MCV and MCH often appear side by side on a blood test or lab report. Together, they help show how red cell size and hemoglobin content vary in the sample.

How They Relate

MCV measures cell volume, while MCH measures hemoglobin mass per cell. In practice, MCV and MCH often move in similar directions because larger red blood cells usually carry more hemoglobin, and smaller cells usually carry less. The link is not exact, though, because MCH depends on both cell size and how densely hemoglobin is packed inside the cell. That is why the MCV vs MCH comparison is useful: one number describes size, and the other describes content. On a CBC, MCV and MCH work as paired indicators of red cell composition.

Key Differences

Aspect Mean Corpuscular Volume Mean Corpuscular Hemoglobin
What it measures Red cell size Hemoglobin per cell
Units fL pg
Typical adult range 80–100 27–33
Reported as Volume Mass
Directly reflects Cell volume Pigment load
How it's calculated Average cell volume Hemoglobin ÷ cells
Common pairing With MCH With MCV

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Reading Them Together

When MCV and MCH are read together, they give a compact view of red blood cell composition. If MCV is higher and MCH is also higher, the cells are usually larger and carry more hemoglobin per cell. If MCV is lower and MCH is also lower, the pattern points to smaller cells with less hemoglobin content. If MCV changes but MCH changes less, the sample may show cells that differ more in size than in hemoglobin load. The MCV vs MCH pattern is most useful when both values are compared on the same CBC report.

When Both Are Tested

MCV and MCH are both included on the complete blood count (CBC) panel. They also appear on many routine lab reports that include red blood cell indices, even when the main reason for testing is general screening. On a CBC, MCV and MCH are usually listed alongside related values such as red blood cell count and hemoglobin concentration. That makes the CBC the main panel for comparing MCV vs MCH on a lab report. In most routine settings, both values are measured from the same sample at the same time.

Frequently Asked Questions

What is the difference between MCV and MCH?
MCV measures the average size of red blood cells, while MCH measures the average amount of hemoglobin in each cell. In MCV vs MCH comparisons, one value is about cell volume and the other is about hemoglobin content. Both appear on the CBC and help describe red blood cell composition on a blood test.
Which is more important, MCV or MCH?
Neither MCV nor MCH is more important in every case. They answer different questions: MCV shows size, and MCH shows hemoglobin per cell. The difference between MCV and MCH matters because each adds a separate detail to the CBC picture.
Why are MCV and MCH tested together?
MCV and MCH are tested together because they come from the same red blood cell sample and describe related features. MCV and MCH on a blood test help show whether cell size and hemoglobin content move together or apart. That pairing makes the CBC more complete than either value alone.
Can MCV be high while MCH is low?
Yes, that pattern can happen. A higher MCV means larger cells, while a lower MCH means those cells carry less hemoglobin than expected for their size. The MCV vs MCH combination can therefore show mixed red cell composition patterns on a lab report.
How are MCV and MCH related mathematically?
MCH is closely tied to hemoglobin amount per cell, while MCV is tied to cell size. They are related because larger cells often contain more hemoglobin, but there is no direct fixed conversion between MCV and MCH. The difference between MCV and MCH is that they are separate calculations from the CBC data.
What units are MCV and MCH measured in?
MCV is usually measured in femtoliters (fL), while MCH is usually measured in picograms (pg). These units show that MCV tracks volume and MCH tracks mass per cell. On a CBC, MCV and MCH are listed with their own distinct units.
Are MCV and MCH part of the same panel?
Yes. MCV and MCH are both part of the complete blood count (CBC) panel. They are common red blood cell indices and are often shown together on the same lab report.
What does high MCV with high MCH usually reflect?
High MCV with high MCH usually means the red blood cells are larger and contain more hemoglobin per cell. In the MCV vs MCH comparison, both values rising together often points to a shift in red blood cell size and content. The exact pattern depends on the full CBC context.
What does low MCV with low MCH usually reflect?
Low MCV with low MCH usually means the cells are smaller and carry less hemoglobin per cell. On a blood test, that paired change shows a consistent shift in red blood cell composition. MCV and MCH together make the pattern easier to see than either value alone.

Disclaimer

This content is for informational and educational purposes only. It is not intended as medical advice, diagnosis, or treatment recommendation. Reference ranges may vary by laboratory. Always discuss your results with a qualified healthcare professional.