Joseph F. O'Donnell MD


Hemoglobin F (HbF)

Hemoglobin is the oxygen-carrying substance in red blood cells. Fetal hemoglobin (HbF) is the type of hemoglobin produced by a fetus’s body. At birth, babies typically have half fetal hemoglobin and half adult hemoglobin (HbA). After birth, HbF is gradually replaced by HbA. With certain diseases, such as sickle cell…

Hemoglobin C Trait

The hemoglobin C trait is the presence of an abnormal type of the oxygen-carrying substance in red blood cells (hemoglobin) called hemoglobin C. People who have hemoglobin C trait also have some normal hemoglobin (hemoglobin A) so they rarely have problems from the condition, but they can pass on the trait to their…

Hemoglobin E Trait

The hemoglobin E trait is the presence of an abnormal type of the oxygen-carrying substance in red blood cells (hemoglobin) called hemoglobin E. Because people who have hemoglobin E trait also have some normal hemoglobin (hemoglobin A), they rarely have problems from the condition but can pass on the trait to their…

Hemoglobin C Trait

The hemoglobin C trait is the presence of an abnormal type of the oxygen-carrying substance in red blood cells (hemoglobin) called hemoglobin C. People who have hemoglobin C trait also have some normal hemoglobin (hemoglobin A) so they rarely have problems from the condition, but they can pass on the trait to their…

Hemoglobin E Trait

The hemoglobin E trait is the presence of an abnormal type of the oxygen-carrying substance in red blood cells (hemoglobin) called hemoglobin E. Because people who have hemoglobin E trait also have some normal hemoglobin (hemoglobin A), they rarely have problems from the condition but can pass on the trait to their…