Cross-section

CJC-1295 (no DAC) 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 CJC-1295 (no DAC), with a class minimum gradient of 15 min, the method is a live explanation.

137 recordsmedian 98.61 %spec 98.0 %

Laboratory	Reports	Gradient	MS resolution	Median purity %	Published bias (pp)	Bias-adjusted	Method suitability
Janoshik	60	30min	High	98.62	+0.00	98.62	ADEQUATE
PeptideMeter	24	28min	High	98.53	-0.05	98.58	ADEQUATE
Medutest	23	25min	Unit	98.69	+0.08	98.61	ADEQUATE
VendorInvestigate	15	32min	High	98.39	-0.11	98.50	ADEQUATE
Nordanalyt	10	35min	High	98.04	+0.02	98.02	ADEQUATE
Kestrel	5 n=5	15min	Unit	99.80	+0.24	99.56	ADEQUATE

Figure. CJC-1295 (no DAC) 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.