Simply Forensic Reference Library
Measurement Uncertainty
Quality, Validation & Reliability
Definition. A parameter describing the dispersion of values reasonably attributable to a quantity being measured under a defined measurement model.
How the term is used
Laboratories estimate uncertainty where relevant to explain the limits of quantitative measurement and reporting.
Forensic example
An alcohol result is reported with a suitable estimate of measurement uncertainty.
Interpretation limitation
Uncertainty does not simply equal error and must not be treated as a blanket invalidation of a method.
References and further reading
NIST OSAC forensic terminology. The explanation and example are original educational summaries; consult the cited material and current laboratory guidance for authoritative application.