To establish an accurate cholinesterase baseline, which conditions must be met?

• A. The previous 30 days were free of OP exposures, and no cholinesterase-inhibiting pesticides were handled in the immediate prior 30 days
• B. The worker has fasted 12 hours prior to testing
• C. The tests are conducted weekly
• D. The worker wears PPE during testing

Answer: (A)

Baseline cholinesterase testing is done when the worker hasn’t been exposed to cholinesterase-inhibiting pesticides for a sufficient period, so the measured enzyme activity reflects their normal, non-exposed state. In practice, waiting about 30 days without exposure allows the enzymes to recover from any inhibition and provides an accurate reference value. That’s why having the previous 30 days free of organophosphate exposures and ensuring no cholinesterase-inhibiting pesticides were handled in the immediate prior 30 days is the best condition for establishing an accurate baseline.

Fasting isn’t required, weekly testing isn’t about creating a baseline, and wearing PPE during testing doesn’t affect the baseline measurement.