What does a quantal dose-response curve measure?

What does a quantal dose-response curve measure?

• A. Magnitude of response in individuals
• B. Time to onset of response
• C. Percent of population showing a response
• D. Maximum effect achieved

Answer: (C)

Quantal dose-response curves gauge how many individuals in a population exhibit a defined effect at each dose. In this approach, each subject is classified as a responder or nonresponder for that endpoint, and the curve plots the percentage of responders against dose. This lets you see how population sensitivity varies and to estimate doses like the ED50, where 50% respond. It's different from a graded curve, which tracks the magnitude of response in individuals (how strong the effect is) rather than simply whether the effect occurs. Time to onset and maximum effect are kinetic or magnitude concepts seen in graded curves, not what the quantal curve measures.

Quantal dose-response curves gauge how many individuals in a population exhibit a defined effect at each dose. In this approach, each subject is classified as a responder or nonresponder for that endpoint, and the curve plots the percentage of responders against dose. This lets you see how population sensitivity varies and to estimate doses like the ED50, where 50% respond. It's different from a graded curve, which tracks the magnitude of response in individuals (how strong the effect is) rather than simply whether the effect occurs. Time to onset and maximum effect are kinetic or magnitude concepts seen in graded curves, not what the quantal curve measures.