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When scientists want to understand how dangerous a toxic substance is, they use something called the "median lethal dose" or LD50. This tells us how much of the substance it takes to be deadly.

This measurement is called the LD 50, which is short for Lethal Dose 50%. The LD 50 is expressed in milligrams per kilogram (mpk) of body weight of the animal. For example, if Chemical X has an LD 50 ...

Animal Aid hosted a roundtable in Westminster, to meet with MPs and other invited guests to discuss the ending the LD50 and other animal tests.

The 50% lethal dose (LD50) values are 400 mg/kg in mice, 385 mg/kg in rats and 140 mg/kg in rabbits and dogs. However, these values are only approximate, as they depend on the infusion rate.