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.

55 recordsmedian 99.23 %spec 98.5 %

Laboratory	Reports	Gradient	MS resolution	Median purity %	Published bias (pp)	Bias-adjusted	Method suitability
Janoshik	29	30min	High	98.84	+0.00	98.84	ADEQUATE
PeptideMeter	9	28min	High	99.21	-0.05	99.26	ADEQUATE
Medutest	8	25min	Unit	99.84	+0.08	99.76	ADEQUATE
VendorInvestigate	3 n=3	32min	High	97.73	-0.11	97.84	ADEQUATE
Nordanalyt	3 n=3	35min	High	99.33	+0.02	99.31	ADEQUATE
Kestrel	3 n=3	15min	Unit	98.68	+0.24	98.44	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.