Plasma concentrations of hemopexin, haptoglobin and heme were determined in patients with various hemolytic diseases. Diminished concentrations of hemopexin were found only when the concentrations of haptoglobin were decreased; the former were not in all instances lowered to the same extent as the haptoglobin levels. Invariably, high concentrations of heme were associated with low concentrations of hemopexin.
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