Practice Test GeeksABT - American Board of Toxicology Practice Test
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Occupational Toxicology Flashcards

7 cards from real ABT practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

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  1. Which organization establishes Threshold Limit Values (TLVs) for occupational chemical exposures?

    Answer: ACGIH

    The ACGIH (American Conference of Governmental Industrial Hygienists) establishes TLVs as voluntary guidelines for occupational chemical exposures.

  2. OSHA Permissible Exposure Limits (PELs) are typically expressed as what type of measurement?

    Answer: 8-hour time-weighted average (TWA)

    OSHA PELs are expressed as 8-hour time-weighted averages reflecting exposures over a standard workday.

  3. For volatile organic compounds (VOCs) in the workplace, which route of exposure is generally most significant?

    Answer: Inhalation

    Inhalation is the primary route of exposure for VOCs because their high vapor pressure results in significant airborne concentrations in occupational settings.

  4. Under OSHA's lead standard for general industry, at what blood lead concentration must a worker be medically removed from exposure?

    Answer: 60 µg/dL

    OSHA's lead standard (29 CFR 1910.1025) requires mandatory medical removal when a worker's blood lead level reaches 60 µg/dL.

  5. The 'skin' notation on an ACGIH TLV primarily indicates that:

    Answer: Significant dermal absorption can contribute to the total body burden

    The 'skin' notation indicates that dermal absorption is significant enough to contribute appreciably to overall exposure and potential systemic toxicity.

  6. Red blood cell (erythrocyte) cholinesterase activity is the preferred biomarker for monitoring occupational exposure to which class of pesticides?

    Answer: Organophosphates

    Organophosphates irreversibly inhibit cholinesterase; red blood cell cholinesterase reflects cumulative inhibition over the approximately 120-day lifespan of the erythrocyte.

  7. In the hierarchy of occupational health controls, which control method is most preferred because it completely removes the hazard?

    Answer: Elimination

    Elimination is the highest priority in the hierarchy of controls because it completely removes the hazard from the workplace, providing the greatest level of worker protection.