If two baseline cholinesterase tests differ by as much as 20 percent, what is commonly recommended?

• A. No additional tests
• B. A third test
• C. Discontinue testing
• D. Immediate treatment

Answer: (B)

Establishing a reliable baseline for cholinesterase activity is essential when monitoring workers exposed to cholinesterase-inhibiting pesticides. When two baseline measurements differ by as much as 20 percent, a third test is commonly recommended to confirm a stable baseline. This extra test helps separate true individual variation from lab or sample variability, giving you a dependable reference point. With three results, you can identify the most consistent value or average them to define the true baseline, which makes future comparisons meaningful and reduces the risk of false alarms or missed exposure. Discontinuing testing or treating based on a single baseline discrepancy isn’t appropriate, and skipping an additional baseline check would leave the monitoring uncertain.