MCV is a measurement of the average size of your red blood cells. What Do High MCH Levels Mean? Your MCH will reflect your MCV. When the MCV is high, they are called macrocytic. Mean corpuscular volume (MCV), mean corpuscular hemoglobin (MCH), and mean corpuscular hemoglobin concentration (MCHC) were first introduced by. Erythrocyte indices (Hemoglobin, Hematocrit, MCV, MCH & MCHC) What Do These Lab Tests Mean? 115,358 views115K views. An MCV blood test measures the size of your red blood cells.