Amanda suffers from a condition that reduces her blood's ability to carry oxygen. what is the name of that condition?

Amanda's condition is called sickle cell anemia. Those with typical anemia have no problem transporting oxygen throughout the body; they just have a problem with iron binding onto the red blood cells. Those with sickle cell anemia, their red cells are the shape of a crescent moon; rather than a circle. Our oxygen binds to our red blood cells to transport throughout the body. When there is a misshapen cell, it cannot carry the amount of oxygen on it that a normal red cell can.

Ibelieve this would be an obstacle.