The phrase LC50 is associated with which measure?

The phrase LC50 is associated with which measure?

• A. LD50
• B. ED50
• C. TD50
• D. LC50

Answer: (D)

LC50 is the concentration of a chemical in the exposure environment that will kill 50% of the test population during a defined exposure period. This is an inhalation/environmental toxicity measure, so it uses concentration units (such as mg/m³ or ppm), not a dose per body weight. It tells you how potent a substance is when animals (or pests) are exposed to it in air or other environmental media. This differs from LD50, which is the lethal dose per body weight (mg/kg) typically for ingestion or dermal exposure; ED50, the dose that produces 50% of the desired effect; and TD50, the dose that causes toxicity in 50% of subjects. In practice, LC50 helps evaluate hazards from airborne or environmental exposures by indicating the concentration at which half the population would die under the test conditions.

LC50 is the concentration of a chemical in the exposure environment that will kill 50% of the test population during a defined exposure period. This is an inhalation/environmental toxicity measure, so it uses concentration units (such as mg/m³ or ppm), not a dose per body weight. It tells you how potent a substance is when animals (or pests) are exposed to it in air or other environmental media.

This differs from LD50, which is the lethal dose per body weight (mg/kg) typically for ingestion or dermal exposure; ED50, the dose that produces 50% of the desired effect; and TD50, the dose that causes toxicity in 50% of subjects. In practice, LC50 helps evaluate hazards from airborne or environmental exposures by indicating the concentration at which half the population would die under the test conditions.