Which statement is true about cholinesterase monitoring?

• A. If cholinesterase returns to preexposure baseline, the worker can safely resume contact with organophosphate and carbamate insecticides
• B. Cholinesterase levels do not affect exposure risk
• C. Monitoring is optional for all workers
• D. Baseline levels are irrelevant

Answer: (A)

Cholinesterase monitoring hinges on tracking how exposure to organophosphate and carbamate insecticides temporarily inhibits acetylcholinesterase. A baseline level is established when a worker is not exposed. If enzyme activity declines during exposure, it signals possible uptake of the chemical. The important point is that when cholinesterase activity returns to that preexposure baseline, the enzyme has regained its normal function, indicating the inhibition has resolved. Under standard safety programs, this recovery means the worker can safely resume contact with these insecticides, assuming other medical and procedural criteria are met.

Monitoring is not optional, because it directly informs when the worker is at risk and when it’s appropriate to reintroduce exposure. Baseline levels are essential for interpretation, and the monitoring results do affect exposure risk, so those statements are not correct.