Certain safety factor

The Certain Safety Factor is the ratio of the lethal dose to 1% of population to the effective dose to 99% of the population (LD1/ED99). This is a better safety index than the LD₅₀ for materials that have both desirable and undesirable effects, because it factors in the ends of the spectrum where doses may be necessary to produce a response in one person but can, at the same dose, be lethal in another.

Additional recommended knowledge

Safe Weighing Range Ensures Accurate Results

Weighing the right way

Daily Visual Balance Check

See also

• Therapeutic index
• Effective dose
• IC₅₀
• LD₅₀
• EC₅₀

References

http://www.courses.vcu.edu/ptxed/m2/faqs_damaj.htm