LC50 and LD50 measure which of the following factors?

• A. Hazard & toxicity
• B. Death
• C. Different product's toxicity
• D. Different product's formulation

Answer: (A)

LD50 and LC50 quantify acute toxicity by identifying the dose or concentration that will kill 50% of a test population under defined conditions. This makes them a direct measure of the substance’s potency and the hazard it poses: the lower the LD50/LC50, the more toxic and hazardous the substance is. While death is the endpoint used in these tests, the factor being measured is the substance’s toxicity (and the associated hazard), not merely the occurrence of death. These values reflect the intrinsic toxic potential of the chemical itself, rather than differences arising from a product’s formulation, which can influence exposure but doesn’t change the inherent toxicity.