Lethal dose  

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In toxicology, the lethal dose (LD) is an indication of the lethal toxicity of a given substance or type of radiation. Because resistance varies from one individual to another, the "lethal dose" represents a dose (usually recorded as dose per kilogram of subject body weight) at which a given percentage of subjects will die. The lethal concentration is a lethal dose measurement used for gases or particulates. The LD may be based on the standard person concept, a theoretical individual that has perfectly "normal" characteristics, and thus not apply to all sub-populations.

See also

• IDLH
• Certain safety factor
• Therapeutic index
• Protective index
• Fixed Dose Procedure to estimate LD₅₀
• Median lethal dose, LD₅₀
• Median toxic dose (TD₅₀)
• Lowest published toxic concentration (TCLo)
• EC₅₀ (half maximal effective concentration)
• IC₅₀ (half maximal inhibitory concentration)
• Draize test
• Indicative limit value
• No-observed-adverse-effect level (NOAEL)
• Lowest-observed-adverse-effect level (LOAEL)
• Up-and-down procedure
• TCID₅₀ Tissue Culture Infective Dosage
• EID₅₀ Egg Infective Dosage
• ELD₅₀ Egg Lethal Dosage
• Plaque forming units (pfu)