Health Risk Assessment of Toxicants: Dose-Response Study

Flashcards related to key terms and concepts from the lecture on Health Risk Assessment of Toxicants, focusing on Dose-Response for Non-Cancer.

Dose-Response Assessment

The process of characterizing the relationship between the dose of a chemical and the extent or incidence of an adverse health effect.

NOAEL

No-Observed-Adverse-Effect Level; the highest dose at which no significant adverse effects are observed.

LOAEL

Lowest-Observed-Adverse-Effect Level; the lowest dose at which significant adverse effects are observed.

BMD

Benchmark Dose; an exposure level linked to a low risk of adverse health effects.

BMDL

Benchmark Dose Lower Confidence Limit; a one-sided confidence limit on the BMD.

Point of Departure (POD)

The dose-response point that marks the beginning of a low dose extrapolation.

Threshold of Effect

The lowest dose at which a measurable effect occurs.

Uncertainty Factor (UF)

A factor applied to account for variability and uncertainty in dose-response assessments.

Toxicokinetics

The study of how a chemical is absorbed, distributed, metabolized, and excreted in the body.

Toxicodynamics

The study of how a chemical interacts with biological targets to produce an effect.

Reference Dose (RfD)

An estimate of the daily exposure to the human population that is unlikely to cause harmful effects.

BMD modeling

Statistical modeling to estimate a dose-response relationship and BMD.

Exposure Duration

The length of time an organism is exposed to a toxicant.

Critical Effect

The first adverse effect or its known precursor that occurs to the most sensitive species with an increasing dose.

Point of Departure Selection

The process of choosing a NOAEL, LOAEL, or BMDL as the reference point for risk assessment.

Interspecies UF

An uncertainty factor used to extrapolate findings from animal studies to humans.

Intraspecies UF

An uncertainty factor used to account for variability among humans.

BMDL versus NOAEL

BMDL is preferred as it uses information from the entire dose-response curve rather than a single point.

Confidence Intervals

A range of values that is likely to include the true value of the effect being measured.

Dose-response Curve

A graph showing the relationship between the dose of a contaminant and the response it produces.

Statistical Significance

A measure that indicates whether the result of a study is likely to be genuine or occurred by chance.