A hereditary condition of the blood in which some red cells become sickle-shaped, but there are not enough affected cells to cause anaemia.
Heterozygous sickle-cell anemia with Both normal and abnormal hemoglobin present. There are usually few or no symptoms, the main concern being possible transmission to offspring.
Inheritance from one parent of one copy of the gene that causes sickle cell anemia. Inheritance from both parents is required for full-blown sickle cell anemia. In the United States, 1 in 12 black people are carriers of the sickle cell trait. Most experience no symptoms, but conditions that greatly increase the oxygen demands on the body, such as extremely high altitudes or extreme cold, may produce a crisis.
The condition of being heterozygous with respect to hemoglobin S, the gene responsible for sickle cell anemia. In people with sickle cell trait each red blood cell has one copy each of hemoglobin A and hemoglobin S. These cells will not become sickled until extremely low concentrations of oxygen occur.