= Pooled quality-control sample
A <pooled quality-control sample> combines representative portions of study samples and is measured repeatedly to monitor analytical consistency. In <metabolomics>, it provides a shared mixture against which changes in retention, signal intensity, or instrument drift can be tracked.
It is distinct from a biological replicate and from a certified concentration standard. A stable pooled sample supports assessment of measurement reproducibility, but does not by itself prove correct identification or absolute quantification of every metabolite.
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