Cross-section

Ipamorelin 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 Ipamorelin, with a class minimum gradient of 15 min, the method is a live explanation.

223 recordsmedian 99.48 %spec 99.0 %

Laboratory	Reports	Gradient	MS resolution	Median purity %	Published bias (pp)	Bias-adjusted	Method suitability
Janoshik	108	30min	High	99.54	+0.00	99.54	ADEQUATE
PeptideMeter	33	28min	High	99.28	-0.05	99.33	ADEQUATE
Medutest	27	25min	Unit	99.72	+0.08	99.64	ADEQUATE
Kestrel	19	15min	Unit	99.84	+0.24	99.60	ADEQUATE
VendorInvestigate	18	32min	High	99.13	-0.11	99.24	ADEQUATE
Nordanalyt	18	35min	High	99.41	+0.02	99.39	ADEQUATE

Figure. Ipamorelin 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.