What is Sickle Cell Trait? Fact Sheet
More than 2 million people in the United States have sickle cell trait. Sickle cell trait occurs when a person has one copy of the sickle cell gene passed down from one parent, and a normal hemoglobin gene from the other parent. This fact sheet describes what sickle cell trait is, who is affected, how to know if you have it, and how to live well with sickle cell trait.