While looking at a patient’s slide under a microscope, a doctor sees blood cells that are shaped like crescents.What disease does the patient have?

Crescent-shaped, or sickle-shaped, red blood cells are characteristic of sickle-cell anemia. Hemophilia affects blood clotting, while multiple sclerosis affects the nervous system and diabetes affects blood sugar regulation. Therefore, the patient has sickle-cell anemia.

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