Final answer:
Red blood cells (RBCs) with an increased mean corpuscle volume (MCV) are referred to as macrocytic, which helps in diagnosing and understanding different types of anemia.
Step-by-step explanation:
RBCs with an increased MCV are called macrocytic. Mean corpuscle volume (MCV) is a common test that measures the size of red blood cells (RBCs). When RBCs are larger than normal, they are referred to as macrocytic, as opposed to normal-sized cells which are called normocytic, and smaller-than-normal cells which are called microcytic. Anemia can significantly impact the body's oxygen delivery system; hence, understanding these classifications can help diagnose the type of anemia affecting a patient.