Cross-section

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

33 recordsmedian 99.12 %spec 98.5 %

Laboratory	Reports	Gradient	MS resolution	Median purity %	Published bias (pp)	Bias-adjusted	Method suitability
Janoshik	15	30min	High	99.07	+0.00	99.07	ADEQUATE
Medutest	6 n=6	25min	Unit	98.95	+0.08	98.87	ADEQUATE
PeptideMeter	3 n=3	28min	High	99.34	-0.05	99.39	ADEQUATE
VendorInvestigate	3 n=3	32min	High	99.10	-0.11	99.21	ADEQUATE
Nordanalyt	3 n=3	35min	High	99.60	+0.02	99.58	ADEQUATE
Kestrel	3 n=3	15min	Unit	99.75	+0.24	99.51	ADEQUATE

Figure. Gonadorelin 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.