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.

43 recordsmedian 98.72 %spec 99.0 %

Laboratory	Reports	Gradient	MS resolution	Median purity %	Published bias (pp)	Bias-adjusted	Method suitability
Janoshik	18	30min	High	98.84	+0.00	98.84	ADEQUATE
VendorInvestigate	8	32min	High	98.27	-0.11	98.38	ADEQUATE
PeptideMeter	7 n=7	28min	High	98.94	-0.05	98.99	ADEQUATE
Medutest	5 n=5	25min	Unit	98.56	+0.08	98.48	ADEQUATE
Nordanalyt	4 n=4	35min	High	98.73	+0.02	98.71	ADEQUATE
Kestrel	1 n=1	15min	Unit	98.28	+0.24	—	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.