Final answer:
Aniso-cytosis refers to the presence of cells of varying sizes, which can be an indication of certain types of anemia or other blood-related disorders. The mean corpuscle volume (MCV) test is used to diagnose this by measuring the average size of red blood cells.
Step-by-step explanation:
Aniso-cytosis refers to a condition where there are cells of varying sizes. It is a term often used in the diagnosis of blood disorders where red blood cells (RBCs) are of different sizes. This can be particularly important in identifying different types of anemia. The mean corpuscle volume (MCV) test measures the average size of RBCs to determine whether they are normocytic (normal-sized), microcytic (smaller than normal), or macrocytic (larger than normal). Monitoring and understanding cell morphologies, such as those in hyperplasia, hypoplasia, or cell necrosis, provide insight into various pathological conditions affecting cells and tissues.
Therefore, when we talk about aniso-cytosis, we are specifically referring to cells of varying sizes, which is option 1 in the context of the question asked. This finding can be associated with a variety of conditions including anemias and other blood cell production disorders.