ABC - DEF - GHI - JKL - MNO - PQRS - TUV - WXYZ
The lowest dose of a chemical at which a specified measurable effect is observed and below which it is not observed.
Examples include LOAEL (Lowest Observed Adverse Effect Level) and NOAEL (No Observed Adverse Effect Level).
When such thresholds are identified, they are usually used to set health standards.
