Intra-individual Variation in Plasma and Erythrocyte Cholinesterase Activities and the Monitoring of Uptake of Organo-phosphate Pesticides

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Abstract
The measurement of plasma and erythrocyte cholinesterase activities is used to monitor absorption of anti-cholinesterase organo-phosphorus compounds. A fall in an individual's enzyme activity signifies excessive exposure if it is clearly greater than the normal intra-individual variation found in unexposed subjects. The extent of normal variation in enzyme activity as measured is dependent on both the true intra-individual biological variation and the precision of the method used. This report defines normal variation in plasma and erythrocyte cholinesterase activity using the assay developed and used routinely in our laboratory.

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