What condition is characterized by a deficiency of red blood cells?

The condition characterized by a deficiency of red blood cells is anemia. This term specifically refers to a lower than normal number of red blood cells or hemoglobin, which can lead to reduced oxygen transport in the body. Anemia can result from various causes, including nutritional deficiencies (such as iron, vitamin B12, or folate), chronic diseases, bone marrow disorders, or increased destruction of red blood cells.

In contrast, angiography is a medical imaging technique used to visualize the inside of blood vessels and organs, and does not pertain to blood cell deficiency. Antigens are substances that can trigger an immune response, while antibodies are proteins produced by the immune system to neutralize antigens. Neither antigens nor antibodies directly relate to the deficiency of red blood cells. Understanding these distinctions is crucial in the context of medicinal and forensic investigations for recognizing various medical conditions and their implications.