Kestrel Bioanalytical

Kestrel is the newest and fastest contributor to the index and the one whose results require the largest correction. Its 15-minute gradient is below the index's minimum acceptable length for the acylated incretins, and the effect is measurable rather than theoretical: Kestrel's purity results read a mean +0.24 pp above the reference across all compounds, and +0.51 pp on the incretin class specifically, where mass-identical diastereomers co-elute into the main peak on a gradient that short.

The index publishes Kestrel data because the alternative — discarding it — would remove a substantial part of the coverage for several thinly-tested suppliers, and because a known and quantified bias is more useful than a missing observation. But it applies two safeguards. Kestrel incretin results are excluded from class-level purity aggregates and are shown on compound pages under a separate heading. And every Kestrel record carries a method-limitation note naming the specific impurities that its gradient does not resolve for that compound.

Identity is at unit resolution, with the same consequences described for Medutest. Repeatability is the widest in the index at 0.34 pp, which is consistent with a short gradient and a young method.

Kestrel's value in the index is as a screening tier: it is well suited to answering "is this roughly what it says it is", and not suited to answering "is this 99.1 % or 98.4 %".