Introduction
Ferritin is your long-term iron storage. Transferrin is your short-term iron storage. The problem with hemochromatosis is that usually in a normal functioning system, there is a hormonal regulatory system that prevents you from absorbing iron from food when you have enough iron that when you have too much iron, shuttle the iron into ferritin which is protective both against pathogens eating the iron to grow and against oxidative stress, which free iron causes, which if you don't know the details about can be thought of as wear and tear on your tissues over time.
In hemochromatosis, normally the way you judge how much iron you have is in the circulating transferrin pool, which is your short-term storage. How full is it? The defect in hemochromatosis is that when the short-term storage, transferrin, starts getting fuller than usual, you don't notice it, so you don't stop absorbing iron from food that makes the transferrin saturation go up even further. But you don't shuttle the iron into ferritin. That makes ferritin lower.
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