The LD-50 is a measure of toxicity describing the dose that kills what percentage of a test population?

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Study for the HazMat Awareness and Operations Exam. Get ready with flashcards and multiple choice questions. Understand key concepts with hints and explanations. Prepare thoroughly for success!

Multiple Choice

The LD-50 is a measure of toxicity describing the dose that kills what percentage of a test population?

Explanation:
LD-50 describes the dose that kills 50% of a test population, i.e., the median lethal dose. It’s derived from dose–response data and is used to compare relative toxicities; a lower LD-50 means greater toxicity because a smaller amount is lethal to half the population. It’s not the dose that kills everyone, and it doesn’t refer to 25% or 75% mortality.

LD-50 describes the dose that kills 50% of a test population, i.e., the median lethal dose. It’s derived from dose–response data and is used to compare relative toxicities; a lower LD-50 means greater toxicity because a smaller amount is lethal to half the population. It’s not the dose that kills everyone, and it doesn’t refer to 25% or 75% mortality.

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