Biological monitoring involves the measurement and assessment of agents or their metabolites in tissues, secretions, excreta, expired air, or any combination to evaluate exposure against a reference.

Biological monitoring involves the measurement and assessment of agents or their metabolites in tissues, secretions, excreta, expired air, or any combination to evaluate exposure against a reference.

• A. Not true
• B. True
• C. Not sure
• D. It refers to something else

Answer: (B)

Biological monitoring is about measuring substances or their metabolites inside the body using samples such as blood, urine, breath, saliva, hair, or other tissues, to determine how much exposure has occurred and then comparing those levels to established reference values (like BEIs or biological exposure limits) to judge whether exposure is within acceptable limits. This approach reflects the actual absorbed dose, integrating all routes and timing of exposure and accounting for how individuals metabolize substances. It’s not just about what's in the workplace air; it shows the internal dose even when environmental measurements might miss or underestimate exposure. Measurements can involve either the parent chemical or its metabolites, and expired air can be used for volatile substances. For example, measuring lead in blood provides a direct indicator of absorbed lead, while urinary metabolites of solvents indicate exposure to those solvents. If the measured value is at or below the reference level, exposure is considered acceptable; if it exceeds the reference, control measures may be needed.

Biological monitoring is about measuring substances or their metabolites inside the body using samples such as blood, urine, breath, saliva, hair, or other tissues, to determine how much exposure has occurred and then comparing those levels to established reference values (like BEIs or biological exposure limits) to judge whether exposure is within acceptable limits. This approach reflects the actual absorbed dose, integrating all routes and timing of exposure and accounting for how individuals metabolize substances. It’s not just about what's in the workplace air; it shows the internal dose even when environmental measurements might miss or underestimate exposure. Measurements can involve either the parent chemical or its metabolites, and expired air can be used for volatile substances.

For example, measuring lead in blood provides a direct indicator of absorbed lead, while urinary metabolites of solvents indicate exposure to those solvents. If the measured value is at or below the reference level, exposure is considered acceptable; if it exceeds the reference, control measures may be needed.