Congenital spherocytic anemia is a disorder of the surface layer (membrane) of red blood cells. It leads to red blood cells that are shaped like spheres, and premature breakdown of red blood cells (
Hereditary spherocytosis; Spherocytosis
Causes, incidence, and risk factors
This disorder is caused by a defective gene. The defect results in an abnormal red blood cell membrane. The affected cells have a smaller surface area for their volume than normal red blood cells, and can break open easily. Having a family history of spherocytosis increases the risk for this disorder.
This disorder is most common in people of northern European descent, but it has been found in all races.
Infants may have yellowing of the skin and eyes (jaundice) and pale coloring (pallor).
Other symptoms may include:
Shortness of breath Weakness
Signs and tests
In most cases, the spleen is enlarged.
Laboratory tests can help diagnose this condition. Tests may include:
Blood smear to show abnormally shaped cells
Complete blood count to check for anemia
- LDH level
Osmotic fragility Reticulocyte count
Surgery to remove the spleen (
Families with a history of spherocytosis should have their children screened for this disorder.
Children should wait until age 5 to have splenectomy because of the infection risk. In mild cases discovered in adults, it may not be necessary to remove the spleen.
Children and adults should be given a pneumococcal vaccine before spleen removal surgery, and also may receive folic acid supplements. Additional vaccines may be indicated based on the patient’s history.
This outcome is usually good with treatment. After the spleen is removed, the life span of the red blood cell returns to normal.
- Much lower red blood cell production (aplastic crisis) caused by a viral infection, which can make anemia worse
Calling your health care provider
Call your health care provider for an appointment if your symptoms get worse, do not improve with treatment, or if you develop new symptoms.
This is an inherited disorder and may not be preventable. Being aware of your risk, such as a family history of the disorder, may help you get diagnosed and treated early.