Cholinesterase monitoring is used to monitor exposure to which pesticide classes?

• A. Organophosphate and carbamate insecticides
• B. Pyrethroid insecticides only
• C. Fungicides
• D. Herbicides

Answer: (A)

Cholinesterase monitoring is used because certain pesticides block the enzyme that normally breaks down acetylcholine in nerve junctions. When this enzyme is inhibited by exposure to these pesticides, acetylcholine builds up and nerves become overstimulated. By measuring cholinesterase activity, labs can detect exposure early and prompt protective actions before symptoms appear. The two pesticide classes known to cause this inhibition are organophosphates and carbamates, which is why monitoring targets those exposures. Pyrethroid, fungicide, and herbicide exposures do not typically involve acetylcholinesterase inhibition, so they aren’t the focus of cholinesterase monitoring.