Final answer:
Red blood cells with an increased mean corpuscle volume (MCV) are called macrocytic, which can indicate macrocytic anemia, often due to vitamin B12 or folate deficiency.
Step-by-step explanation:
RBCs (red blood cells) with an increased mean corpuscle volume (MCV) are referred to as macrocytic. Conditions such as anemias can be diagnosed using the morphological approach, which includes the evaluation of the size of the RBCs through MCV measurements. While normocytic cells are of normal size, and microcytic cells are smaller than normal, macrocytic cells are larger than normal. Changing RBC sizes can indicate various medical conditions, and an elevated MCV typically suggests the presence of macrocytic anemia. This condition can be due to several causes, such as vitamin B12 deficiency or folate deficiency. It is important to monitor and manage these conditions as RBCs are essential for delivering oxygen to body tissues, and changes in their count and morphology can have significant effects on overall health.