Pancytopenia refers to reductions in which components?

• A. All three major blood cell lines: red cells, white cells, and platelets
• B. Only red blood cells
• C. Only white blood cells
• D. Only platelets

Answer: (A)

Pancytopenia means a decrease in all three major blood cell lines: red blood cells, white blood cells, and platelets. This reflects a problem with bone marrow output or widespread destruction affecting the production of all lineages, not just one. Clinically, low red cells cause fatigue and pallor, low white cells raise infection risk, and low platelets lead to easy bruising or bleeding. Pancytopenia can arise from bone marrow failure or infiltration (like aplastic anemia, leukemia, or marrow metastasis), suppression from chemotherapy or radiation, vitamin B12 or folate deficiency, or hypersplenism. If only one line were reduced, it would be anemia, leukopenia, or thrombocytopenia, not pancytopenia.