Terms & Definitions • 293 precision


The closeness of agreement (i.e., degree of scatter) among a series of meas- urements obtained from the same homogenous sample under controlled assay conditions. Precision is defined as (standard deviation/mean) × 100%. Three levels can be distinguished: „ Repeatability;


„ Intermediate precision; „ Reproducibility.


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• 294 preclinical trial A study to test a drug, procedure, or medical treatment in animals.


• 295 precursor ion See “parent ion”.


• 296 predictive metabolomics


Prediction of the functional value of a treatment by means of multivariate analysis using metabolome data (metabolite signatures) as the explanatory variable.


• 297 predose sample


Biological sample, typically plasma, that is taken from the test subjects prior to receiving the study drug(s).


• 298 preventative maintenance (PM) Scheduled equipment maintenance in bioanalytical laboratories.


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