Cross-section

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

58 recordsmedian 99.06 %spec 98.0 %

Laboratory	Reports	Gradient	MS resolution	Median purity %	Published bias (pp)	Bias-adjusted	Method suitability
Janoshik	29	30min	High	99.14	+0.00	99.14	ADEQUATE
Medutest	12	25min	Unit	98.97	+0.08	98.89	ADEQUATE
VendorInvestigate	6 n=6	32min	High	98.75	-0.11	98.86	ADEQUATE
PeptideMeter	5 n=5	28min	High	98.71	-0.05	98.76	ADEQUATE
Kestrel	4 n=4	15min	Unit	99.34	+0.24	99.10	ADEQUATE
Nordanalyt	2 n=2	35min	High	98.76, 98.30	+0.02	—	ADEQUATE

Figure. Sermorelin 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.