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Threshold (in health science)

Definition:

The lowest dose of a chemical at which a specified measurable effect is observed and below which it is not observed.

Source: National Safety Council Environmental Glossary  

More:

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.

Source: National Safety Council Environmental Glossary  

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