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In page Pesticide poisoning:

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If one is regularly using carbamate and organophosphate pesticides, it is important to obtain a baseline cholinesterase test.[2][3] Cholinesterase is an important enzyme of the nervous system, and these chemical groups kill pests and potentially injure or kill humans by inhibiting cholinesterase. If one has had a baseline test and later suspects a poisoning, one can identify the extent of the problem by comparison of the current cholinesterase level with the baseline level.[citation needed]