Which metric is used to compare acute toxicity such that a smaller value indicates higher toxicity?

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Study for the Toxicology Test. Cover key concepts, exposure, and chemical hazards through multiple choice questions with explanations. Prepare effectively for your exam!

Multiple Choice

Which metric is used to compare acute toxicity such that a smaller value indicates higher toxicity?

Explanation:
Smallest amount needed to cause death in 50% of a test group defines acute toxicity with LD50. This metric is a dose expressed per body weight (for example, mg/kg), so a lower LD50 means the chemical is more toxic because only a small amount is required to be lethal. LD50 is the standard way to compare acute toxicity because it directly reflects lethality as a function of dose. Other metrics measure different outcomes or use different units: LC50 uses concentration (for inhalation or aquatic exposure), TD50 is the dose causing a specified toxic effect (not necessarily death), and ED50 is the dose producing a desired therapeutic effect.

Smallest amount needed to cause death in 50% of a test group defines acute toxicity with LD50. This metric is a dose expressed per body weight (for example, mg/kg), so a lower LD50 means the chemical is more toxic because only a small amount is required to be lethal. LD50 is the standard way to compare acute toxicity because it directly reflects lethality as a function of dose. Other metrics measure different outcomes or use different units: LC50 uses concentration (for inhalation or aquatic exposure), TD50 is the dose causing a specified toxic effect (not necessarily death), and ED50 is the dose producing a desired therapeutic effect.

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