G6PD Deficiency
(Glucose-6-phosphate Dehydrogenase Deficiency)

• What is glucose-6-phosphate dehydrogenase deficiency?
• How common is glucose-6-phosphate dehydrogenase deficiency?
• What genes are related to glucose-6-phosphate dehydrogenase deficiency?
• How do people inherit glucose-6-phosphate dehydrogenase deficiency?
• What other names do people use for glucose-6-phosphate dehydrogenase deficiency?

What is glucose-6-phosphate dehydrogenase deficiency?

Glucose-6-phosphate dehydrogenase deficiency is a genetic disorder that occurs most often in males. This condition mainly affects red blood cells, which carry oxygen from the lungs to tissues throughout the body. In affected individuals, a defect in an enzyme called glucose-6-phosphate dehydrogenase causes red blood cells to break down prematurely. This destruction of red blood cells is called hemolysis.

The most common medical problem associated with glucose-6-phosphate dehydrogenase deficiency is hemolytic anemia, which occurs when red blood cells are destroyed faster than the body can replace them. This type of anemia leads to paleness, yellowing of the skin and whites of the eyes (jaundice), dark urine, fatigue, shortness of breath, and a rapid heart rate. In people with glucose-6-dehydrogenase deficiency, hemolytic anemia is most often triggered by bacterial or viral infections or by certain drugs (such as some antibiotics and medications used to treat malaria). Hemolytic anemia can also occur after eating fava beans or inhaling pollen from fava plants (a reaction called favism).

Glucose-6-dehydrogenase deficiency is also a significant cause of mild to severe jaundice in newborns. Many people with this disorder, however, never experience any signs or symptoms.

How common is glucose-6-phosphate dehydrogenase deficiency?

An estimated 400 million people worldwide have glucose-6-phosphate dehydrogenase deficiency. This condition occurs most frequently in certain parts of Africa, Asia, and the Mediterranean. It affects about 1 in 10 African-American males in the United States.

Suggested Reading by Our Doctors

• Hemoglobin - Read about hemoglobin - the protein molecule in red blood cells. Learn what normal, low, and high level hemoglobin counts mean on MedicineNet.com
• Anemia - Read about anemia (low blood cell count, low hemoglobin) causes like iron deficiency, stomach ulcers, medications, colon cancer, trauma, vitamin 12 or folate deficiency, leukemia, myltiple myeloma and more.
• Jaundice - Jaundice Jaundice is the yellowish staining of the skin and the whites of the eye. Jaundice has many causes.

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