Abstract
A simultaneous estimation of peroxidase in plasma and per single myeloid cell was carried out by my own colorimetric method in 42 normal subjects and 101 cases with various disorders. Abnormally high values for peroxidase per single myeloid cell were found in cases of neoplasm, mild form of progressive muscular dystrophy and lupoid hepatitis. Less probably it might be said that in the cases with chronic hepatitis, glycogen storage disease, albinism, ecthyma, sepsis and rheumatic fever an abnormally high level of peroxidase per single myeloid cell would be found. Extremely high values for plasma peroxidase were found in cases of peroxidase positive myeloblastic leukemia. A considerably high value for plasma peroxidase was found in 1 case with encephalitis of unknown etiology. Abnormally low levels for peroxidase per single myeloid cell were found in cases of chronic agranulocytosis, and gargoylism, and less probably in the cases with hypochromic anemia, acquired hemolytic anemia, osteochondrodystrophy and rheumatoid arthritis.

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