Which term describes the presence of large, irregularly shaped red blood cells?

• A. Immunoglobulins
• B. Stridor
• C. Poikilocytosis
• D. Sputum

Answer: (C)

Focus on red blood cell morphology. Poikilocytosis is the presence of red blood cells that are irregularly shaped. This describes abnormal erythrocyte morphology seen in various conditions and fits the idea of cells that are not only large but also misshapen. The other terms relate to different things: immunoglobulins are antibodies, stridor is an audible sign of airway obstruction, and sputum is mucus from the airways. So the description of large, irregularly shaped red cells best matches poikilocytosis.