Cross-section

Hexarelin by laboratory

The same compound measured by different laboratories on different gradients. Where the medians differ, the question is whether the material differed or the method did — and for Hexarelin, with a class minimum gradient of 15 min, the method is a live explanation.

48 recordsmedian 99.59 %spec 99.0 %

Laboratory	Reports	Gradient	MS resolution	Median purity %	Published bias (pp)	Bias-adjusted	Method suitability
Janoshik	23	30min	High	99.76	+0.00	99.76	ADEQUATE
PeptideMeter	11	28min	High	99.35	-0.05	99.40	ADEQUATE
Nordanalyt	5 n=5	35min	High	99.61	+0.02	99.59	ADEQUATE
Medutest	3 n=3	25min	Unit	99.55	+0.08	99.47	ADEQUATE
VendorInvestigate	3 n=3	32min	High	99.68	-0.11	99.79	ADEQUATE
Kestrel	3 n=3	15min	Unit	99.28	+0.24	99.04	ADEQUATE

Figure. Hexarelin purity by contributing laboratory. Any offset between rows has two possible sources — a real difference in the material each laboratory happened to receive, and the laboratory's own bias — and this figure cannot separate them. The paired analysis that can is on inter-lab agreement.