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.

204 recordsmedian 99.47 %spec 99.0 %

Laboratory	Reports	Gradient	MS resolution	Median purity %	Published bias (pp)	Bias-adjusted	Method suitability
Janoshik	87	30min	High	99.50	+0.00	99.50	ADEQUATE
Medutest	36	25min	Unit	99.38	+0.08	99.30	ADEQUATE
PeptideMeter	32	28min	High	99.44	-0.05	99.48	ADEQUATE
VendorInvestigate	17	32min	High	99.22	-0.11	99.33	ADEQUATE
Nordanalyt	16	35min	High	99.59	+0.02	99.57	ADEQUATE
Kestrel	16	15min	Unit	99.47	+0.24	99.23	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.