Short answer · Medically reviewed summary · Last updated: 2026-05-08
Glucose-6-Phosphate Dehydrogenase Deficiency (G6PD) is one of the most common enzyme deficiencies worldwide, estimated to affect over 400 million people globally. While it is highly prevalent in specific regions, the condition often remains undiagnosed due to the asymptomatic nature of the deficiency in many individuals until a trigger event occurs. What is the global prevalence of Glucose-6-Phosphate Dehydrogenase Deficiency? According to the World Health Organization (WHO), Glucose-6-Phosphate Dehydrogenase Deficiency affects approximately 5% of the world's population.
What is the prevalence of Glucose-6-Phosphate Dehydrogenase Deficiency G6pd?
Prevalence of Glucose-6-Phosphate Dehydrogenase Deficiency G6pd: how many people are affected worldwide, differences by sex and region, with sources.
Glucose-6-Phosphate Dehydrogenase Deficiency (G6PD) is one of the most common enzyme deficiencies worldwide, estimated to affect over 400 million people globally. While it is highly prevalent in specific regions, the condition often remains undiagnosed due to the asymptomatic nature of the deficiency in many individuals until a trigger event occurs.
What is the global prevalence of Glucose-6-Phosphate Dehydrogenase Deficiency?
According to the World Health Organization (WHO), Glucose-6-Phosphate Dehydrogenase Deficiency affects approximately 5% of the world's population. Because the condition is X-linked, it disproportionately affects males. While considered "common" on a global scale rather than rare, it is frequently underdiagnosed because many people live their entire lives without experiencing a hemolytic crisis, leading to significant gaps in clinical reporting.
How do geographic and demographic factors influence G6PD prevalence?
The prevalence of Glucose-6-Phosphate Dehydrogenase Deficiency is highly correlated with regions where malaria is or was historically endemic. This is due to a survival advantage that carriers of the G6PD gene mutation have against malaria. Key demographic patterns include:
- Geographic clustering: Highest rates are found in Africa, the Mediterranean, and Southeast Asia.
- Gender distribution: Males are primarily affected, while females may be carriers or affected if they have mutations on both X chromosomes.
- Age of onset: Symptoms of Glucose-6-Phosphate Dehydrogenase Deficiency can appear at any age, typically triggered by exposure to fava beans, certain medications, or infections.
Why is accurate data on Glucose-6-Phosphate Dehydrogenase Deficiency challenging to obtain?
Accurate statistics for Glucose-6-Phosphate Dehydrogenase Deficiency are difficult to capture because many regional health systems do not perform universal newborn screening for this enzyme. Consequently, many individuals are only diagnosed after a severe hemolytic event. At DiseaseMaps.org, 12 people have joined our community to share their lived experiences, providing essential real-world insights into the variable ways Glucose-6-Phosphate Dehydrogenase Deficiency impacts daily life, which often goes beyond what is captured in static clinical data.
Next steps
- Consult a hematologist or genetic counselor if you suspect you have Glucose-6-Phosphate Dehydrogenase Deficiency or have a family history of hemolytic anemia.
- Request a G6PD enzyme activity blood test if you are planning to take medications known to trigger hemolysis.
- Join the DiseaseMaps.org community to connect with others managing this condition and share your journey.
Medical disclaimer: This information is for educational purposes only and does not constitute professional medical advice, diagnosis, or treatment; always seek the advice of your physician.
References
- World Health Organization (WHO): G6PD Deficiency Database.
- NIH Genetic and Rare Diseases Information Center (GARD): Glucose-6-Phosphate Dehydrogenase Deficiency.
- Orphanet: G6PD deficiency (ORPHA:366).
- OMIM (Online Mendelian Inheritance in Man): Entry #305900.
