Have you stress tested your assay?

Pract Lab Med · 2016 · PMC5574497 · PMID 28856200

Europe PMC DOI

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showed a trendno p-value reported

The daily quality control of the immunoturbidimetric assay also showed a trend of upward drifting, and needed frequent troubleshooting.

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Quoted from the open-access full text in Europe PMC under the licence the publisher applied. The sentence is reproduced exactly as published; the emphasis is ours.