Which term refers to the presence of abnormally large red blood cells in a blood sample?

The term that refers to the presence of abnormally large red blood cells in a blood sample is macrocytosis. This condition indicates an increase in the size of red blood cells, which can be observed under a microscope during a complete blood count (CBC) test. Macrocytosis is often associated with certain types of anemia, such as megaloblastic anemia, which can result from deficiencies in vitamin B12 or folate, impacting proper red blood cell production.

Understanding macrocytosis is essential in a clinical setting because it can provide valuable insights into underlying health conditions. The identification of larger-than-normal RBCs can prompt further investigation into the patient’s nutritional status, bone marrow function, and overall hematologic health.

The other terms present in the choices refer to different conditions; poikilocytosis describes a variation in the shape of red blood cells rather than their size, erythrocytopenia refers to a deficiency in red blood cells overall, and hemorrhage involves loss of blood rather than a change in blood cell size.