carry-over from a preceding sample probe into a following specimen cup, which will influence not just one result, but all assays on that specimen, or with that reagent.
Source:
PAC, 1991, 63, 301. 'Proposals for the description and measurement of carry-over effects in clinical chemistry (Recommendations 1991)' on page 302 (https://doi.org/10.1351/pac199163020301)