median lethal dose: meaning, definition, pronunciation and examples

Not exactly. 'Fatal dose' is a general term for any dose that causes death. The median lethal dose is a specific, statistically derived value representing the dose that would be fatal to 50% of a population.

It provides a standardised, quantitative way to estimate the acute toxicity of a substance for regulatory classification, safety testing, and comparing the potency of different chemicals, before any potential human exposure is considered.

Traditional LD50 tests involved dosing many animals until death. Modern regulations often require alternative methods like the Fixed Dose Procedure or in vitro tests to reduce animal suffering, using fewer animals and causing less distress.

Directly, no. Human LD50 values are not experimentally determined. They are estimated from animal data, accidental poisonings, and case reports, and are used for setting safety limits and emergency response guidelines.

The statistically derived dose of a substance or radiation required to kill 50% of a tested animal population within a specified period, usually a standard measure of toxicity.

Median lethal dose is usually technical/scientific in register.

Median lethal dose: in British English it is pronounced /ˈmiː.di.ən ˈliː.θəl dəʊs/, and in American English it is pronounced /ˈmiː.di.ən ˈliː.θəl doʊs/. Tap the audio buttons above to hear it.