Stochastic effects can be described by which of the following terms?

• A. Random
• B. Probabilistic
• C. Unpredictable
• D. Deterministic

Answer: (B)

Stochastic effects are described as probabilistic because whether the effect occurs in an individual is a matter of probability that increases with dose, rather than a guaranteed outcome. There is no fixed threshold for occurrence, and the severity of the effect for an individual isn’t determined by the dose, only the chance of it happening is. This makes “probabilistic” the precise term.

While randomness captures the idea of unpredictable outcomes, the concept is more accurately expressed through probability tied to dose. Unpredictable is too vague, and deterministic describes effects with thresholds and predictable severity, which does not fit stochastic effects.