Analytical specificity

It covers interference and cross-reactivity, for example from similar organisms or substances in the sample matrix. It is a laboratory property, different from diagnostic specificity, which is about correctly identifying people without the condition.

The ability of an assay to measure in a sample a particular target measurand in the presence of for example other analyte/marker, matrix, interfering substances/organisms or cross-reactive species/agents.

MDCG 2022-2, Section 4, Definitions (source: iteration from several sources)