Meaning
Risk assessment framework used to estimate the safety of chemicals with limited data by assigning them to exposure categories based on structure. It measures the probability of adverse health effects and stops applying when specific toxicological data for the substance becomes available.
Exposure Level
Assessment begins by placing a substance into one of several classes based on its chemical structure and potential for harm. The toxicological concern threshold provides a screening tool for substances found at very low levels in packaging migration studies. If the estimated intake is below the limit, further testing is often deemed unnecessary.
The model assumes a worst case scenario for food consumption.
Safety Margin
Conservative values are used to ensure that even the most sensitive individuals are protected from potential effects. This approach helps in managing non-intentionally added substances where a full toxicological profile is not available. Regulators rely on these thresholds to prioritize which chemicals need the most urgent review.
A high safety factor is built into every threshold calculation.
Data Gap
Use of this method is restricted to substances that are not known to be highly potent or carcinogenic. When a molecule falls into a high risk category, a complete set of laboratory trials is required to prove safety. The threshold acts as a bridge while the industry gathers more detailed information.
