A mean corpuscular volume (MCV) is a type of blood test that measures the size of your red blood cells. A low MCV means that your red blood cells are smaller than average, possibly indicating iron ...

A high MCV means your red blood cells are larger than normal. A high MCV can be associated with a group of cancers called myelodysplastic syndromes. However, other causes of high MCV, such as vitamin ...

What Is an MCV Blood Test? MCV stands for mean corpuscular volume. An MCV blood test measures the average size of red blood cells, which have the critical job of carrying oxygen to your organs. If ...