Cross-section

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

70 recordsmedian 99.44 %spec 98.5 %

Laboratory	Reports	Gradient	MS resolution	Median purity %	Published bias (pp)	Bias-adjusted	Method suitability
Janoshik	30	30min	High	99.36	+0.00	99.36	ADEQUATE
Medutest	13	25min	Unit	99.64	+0.08	99.56	ADEQUATE
VendorInvestigate	7 n=7	32min	High	98.91	-0.11	99.02	ADEQUATE
Nordanalyt	7 n=7	35min	High	99.41	+0.02	99.39	ADEQUATE
Kestrel	7 n=7	15min	Unit	99.66	+0.24	99.42	ADEQUATE
PeptideMeter	6 n=6	28min	High	99.87	-0.05	99.92	ADEQUATE

Figure. Enclomiphene citrate 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.