What is G6PD? Your Complete Guide
G6PD is an enzyme that protects red blood cells from oxidative damage. G6PD deficiency is one of the most common genetic enzyme deficiencies worldwide, affecting millions of people in India.
💡Simply Explained
G6PD is like a shield inside each red blood cell. This shield protects the cell from certain chemicals in food and medicines. If you are born without enough of this shield, certain foods (like fava beans) or medicines can pop your red blood cells like balloons, making you suddenly anemic and turning your pee dark.
📏Normal Range
Typical reference range. Your lab may use slightly different values.
⬆️What High G6PD Means
Possible Causes
- Normal or high activity — not clinically significant
- Reticulocytosis (young red cells have more G6PD, masking deficiency)
- Recent blood transfusion (donor cells have normal G6PD)
Foods That Can Help
- No specific dietary restrictions for normal/high G6PD
⬇️What Low G6PD Means
Possible Causes
- Genetic G6PD deficiency (inherited, X-linked)
- Most common in certain Indian communities — tribal populations, Sindhis, Sardars, Parsis
- Can be triggered into crisis by: primaquine, dapsone, nitrofurantoin, sulfa drugs, fava beans, mothballs (naphthalene)
Foods That Can Help
- Strictly avoid fava beans (broad beans/bakla)
- Avoid artificial food colorings
- Avoid tonic water (contains quinine)
- Avoid large amounts of certain legumes if they trigger symptoms
- Safe foods: most regular Indian diet items are fine
🏃Lifestyle Actions
If Your G6PD Is High
- No action needed for normal or high G6PD
- If reticulocyte count is high, retest G6PD after 2-3 months for accurate results
If Your G6PD Is Low
- Carry a G6PD deficiency card and inform all your doctors
- Avoid trigger medications: primaquine, dapsone, sulfonamides, nitrofurantoin, aspirin (high doses), methylene blue
- Avoid naphthalene mothballs in cupboards
- Before taking ANY new medication, remind your doctor about G6PD deficiency
- Get family members tested — it runs in families
- If having malaria treatment, inform doctor about G6PD status — primaquine can be dangerous
🩺When to See a Doctor
High G6PD
Normal or high G6PD needs no follow-up. If tested during a hemolytic episode and result is borderline, retest in 2-3 months when reticulocyte count has normalized.
Low G6PD
G6PD deficiency with hemolytic symptoms (dark urine, jaundice, severe fatigue, rapid heartbeat) is a medical emergency — go to the hospital immediately. Ongoing low G6PD without symptoms just needs awareness and avoidance of triggers.
🎯Did You Know?
G6PD deficiency is thought to have evolved because it provides some protection against malaria — similar to sickle cell trait. Regions with historically high malaria (Africa, Mediterranean, South/Southeast Asia) have the highest rates of G6PD deficiency!
❓Frequently Asked Questions
What is G6PD?
G6PD is like a shield inside each red blood cell. This shield protects the cell from certain chemicals in food and medicines. If you are born without enough of this shield, certain foods (like fava beans) or medicines can pop your red blood cells like balloons, making you suddenly anemic and turning your pee dark.
What is the normal range for G6PD?
The typical normal range for G6PD is 4.6–13.5 U/gHb.
What causes high G6PD?
Normal or high activity — not clinically significant. Reticulocytosis (young red cells have more G6PD, masking deficiency). Recent blood transfusion (donor cells have normal G6PD).
What causes low G6PD?
Genetic G6PD deficiency (inherited, X-linked). Most common in certain Indian communities — tribal populations, Sindhis, Sardars, Parsis. Can be triggered into crisis by: primaquine, dapsone, nitrofurantoin, sulfa drugs, fava beans, mothballs (naphthalene).
How can I check my G6PD levels?
You can check your G6PD levels with a routine blood test. Upload your lab report to ScanHealth for an instant, plain-language explanation.
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Upload Your ReportThis guide is for informational purposes only and does not constitute medical advice. Reference ranges may vary by lab. Always consult a qualified healthcare provider for diagnosis and treatment.