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Toxicology Glossary - Q

quality assurance: All those planned and systematic actions necessary to provide adequate confidence that a product or service will satisfy given requirements for quality
ISO 8402, 1986
RT good laboratory practice, quality control

quality control

1. Operational techniques and activities that are used to fulfill requirements for quality
   ISO 8402, 1986
2. In toxicology, procedures incorporated in experimental protocols to reduce the possibility of error, especially human error: this is a requirement of good laboratory practice
   RT good laboratory practice, quality assurance.

quantal effect: Condition that can be expressed only as "occurring" or "not occurring," such as death or occurrence of a tumour
AN graded effect
RT stochastic effect
SN all-or-none effect

quantitative structure-activity relationship (QSAR): Quantitative association between the physicochemical properties of a substance and/or the properties of its molecular substructures and its biological properties including its toxicity
RT surrogate