HFE C282Y — hereditary hemochromatosis variant
One copy of HFE C282Y — carrier for hereditary hemochromatosis.
You have one copy of the HFE C282Y DNA change — making you a carrier for hereditary hemochromatosis.
One copy is generally not enough to cause clinical iron overload, though carriers may have very slightly higher iron stores than average.
One copy on its own isn't usually enough to cause real iron overload, though your iron stores might run very slightly higher than average.
What this means
HFE controls how the body absorbs dietary iron. The C282Y variant disrupts HFE function. Two copies is the most common cause of hereditary hemochromatosis, which can lead to iron accumulation in the liver, heart, and pancreas over decades. The condition is highly treatable when caught early (regular phlebotomy), so identifying it before symptoms emerge is one of the most actionable findings in consumer genomics.
The HFE gene controls how much iron your body soaks up from food. This DNA change weakens that control. Two copies is the most common cause of hereditary hemochromatosis, where iron slowly builds up in the liver, heart, and pancreas over decades. The condition is highly treatable if caught early — the treatment is essentially just regular blood donations to bring iron levels down — so picking this up before symptoms appear is one of the most genuinely useful findings you can get from a DNA test.
Caveats
- Penetrance is incomplete. Many C282Y homozygotes never develop iron overload, particularly women whose menstruation removes iron.
- Diagnosis still requires iron-studies blood work (ferritin, transferrin saturation), not genotype alone.
- Treatment when needed is straightforward — periodic phlebotomy.
Populations
- Most common in Northern European populations (about 10% carrier frequency)