Abstract
Hyposthenuria was investigated in subjects with sickle cell trait and in patients with sickle cell anemia. The following were observed: 1) in subjects with sickle cell trait both normal and reduced maxima of urinary concentration are found, whereas all untreated patients with sickle cell anemia over 6 months of age have hyposthenuria; 2) hyposthenuria becomes increasingly more severe with advancing age in both sickle cell anemia and sickle cell trait; 3) in a 6-month-old patient with sickle cell anemia and hyposthenuria, the maxima of urinary concentration returned to normal after two transfusions of normal erythrocytes. Reasons are presented for favoring the hypothesis that hyposthenuria in sickle cell disease is due to renal damage, possibly from intravascular sickling of erythrocytes in renal vessels or from the presence of "free" circulating S-hemoglobin.
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