perturbation
Meaning of perturbation: A perturbation is a disruption to a normally stable system, whether a physiologic process, a biological pathway, or a measurement being taken.
Definition of perturbation
Perturbation is a disturbance or disruption to something that would otherwise remain stable or follow an expected pattern. In medicine and biology, the word is used broadly to describe a disruption to a physiologic process, a biological pathway, a cellular system, or a measurement, without specifying the particular cause.
The term appears across many contexts, including research describing how a drug, mutation, or environmental factor perturbs, or disrupts, the normal activity of a cell or biological pathway, and clinical descriptions of a disturbance to a body system, such as a metabolic or electrolyte perturbation. In each case, perturbation implies a departure from an expected baseline rather than a specific mechanism or outcome.
Because the word describes the presence of disruption rather than its nature, further detail is usually needed to specify what kind of perturbation occurred, how severe it was, and what effect it produced.
Used in a sentence
Laboratory results showed an electrolyte perturbation that prompted further monitoring.
Good to know
Perturbation describes disruption in a general sense and does not by itself indicate whether the change is mild and temporary or significant and lasting; that assessment depends on the specific finding described.