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Serum LDH levels and isoenzyme distribution in patients with sickle cell disease. (A) Distribution of LDH levels on 50 occasions in 33 patients with sickle cell disease. Nearly all results are above the normal range (113-226 IU/L). (B) LDH isoenzyme fractionation of each sample suggests a tendency for the patient values to fall above the normal range (vertical bars to the right of each distribution) for LD1 and LD2 and below the normal range for LD3, LD4, and LD5 isoenzymes.
