This is a type of sickle cell disease (SCD). People who have this form of SCD inherit a sickle cell gene (“S”) from one parent and from the other parent a gene for an abnormal hemoglobin called “C”. Hemoglobin is a protein that allows red blood cells to carry oxygen to all parts of the body. This is usually a milder form of SCD. (Source: CDC)

Haemoglobin SC (HbSC) accounts for 30 percent of sickle cell disease (SCD) in the United States and United Kingdom.