Abstract
We studied 12 members of a family with precirrhotic hemochromatosis to define the physiologic abnormalities in the asymptomatic phase of the disease. Six of 12 had increased iron stores; the mode of inheritance was consistent with an autosomal dominant trait. Serum ferritin levels were no more predictive of tissue iron levels than measurements of serum iron, transferrin saturation or chelatable iron excretion. In three affected family members intestinal iron content was normal. Liver proline hydroxylase activity and urinary hydroxyproline excretion did not correlate with tissue iron content, suggesting that, in addition to the possible role of tissue iron, hepatic fibrosis may involve other factors. "Borderline diabetes mellitus" was present in three affected family members, but extensive studies revealed that pituitary dysfunction is uncommon in early hemochromatosis. Increased levels of liver iron proved to be the most reliable marker for the disease.
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