Our expert says:
These are mostly used to treat hemoglobin deficiency which can be caused either by decreased amount of hemoglobin molecules as in anemia, or decreased ability of each molecule to bind oxygen at the same partial pressure of oxygen. Hemoglobinopathies (genetic defects resulting in abnormal structure of the hemoglobin molecule)may cause both.
In any case, hemoglobin deficiency decreases blood oxygen-carrying capacity.
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