Original: What is an LD50 and LC50 It is being phased out in some jurisdictions in favor of tests such as the Fixed Dose Procedure,LD50 test ban welcomed however the concept, and calculation of the median lethal dose for comparison purposes, is still widely used.
Simplified: The test was created by J.W. Trevan in 1927What is an LD50 and LC50 but is now being phased out in favour of the Fixed Dose ProcedureLD50 test ban welcomed.