Which statement correctly describes prerequisite conditions before establishing a cholinesterase baseline?

• A. The previous 30 days must be free of OP exposures, and no cholinesterase-inhibiting pesticides should have been handled in the immediate 30 days prior
• B. The worker must fast for 8 hours
• C. The test must be performed at a specific time of day
• D. The worker must wear ocular protection during the test

Answer: (A)

Baseline cholinesterase testing aims to measure the worker’s normal enzyme activity, untouched by recent inhibition. Since organophosphates and other cholinesterase inhibitors can temporarily lower activity, you want the baseline to reflect the person’s true level. That means there should be no exposure to OP pesticides in the past 30 days and no handling of cholinesterase-inhibiting pesticides in the immediate prior period. Fasting, time of day, or wearing protective gear during the test don’t influence whether the baseline reflects the true, uninhibited enzyme activity. Therefore, the prerequisite described—no OP exposures in the prior 30 days and no handling of cholinesterase-inhibiting pesticides recently—is the correct condition for establishing a baseline.