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Approved Cholinesterase Laboratories

Regulations relating to Pesticide Worker safety, California Code of Regulations, Title 3, Division 6, Chapter 3, Subchapter 3, Article 2, Section 6728, specify that certain loaders, mixers and applicators of pesticides must be monitored for exposure, as measured by depression of their cholinesterase enzyme activity. Further, the testing may only be done by a laboratory that has been approved by the Department.

The Environmental Health Laboratory Branch is responsible for maintaining the list of Laboratories Approved to Perform Cholinesterase Testing for Occupational Health Surveillance. The list is updated in January and June of each year.

 Current List

Approved Cholinesterase Laboratories (PDF) Opens a new browser window.

Pesticide Exposure Information

California Department of Pesticide Regulation


Frank Barley, Ph.D.
Research Scientist Supervisor, Inorganic Analyses
Environmental Health Laboratory Branch
850 Marina Bay Parkway, G365
Richmond, CA  94804
Telephone: (510) 620-2801
Last modified on: 6/12/2008 2:33 PM