Cross-section

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

21 recordsmedian 98.43 %spec 97.0 %

Laboratory	Reports	Gradient	MS resolution	Median purity %	Published bias (pp)	Bias-adjusted	Method suitability
Janoshik	11	30min	High	98.43	+0.00	98.43	ADEQUATE
PeptideMeter	4 n=4	28min	High	98.66	-0.05	98.70	ADEQUATE
VendorInvestigate	3 n=3	32min	High	96.66	-0.11	96.77	ADEQUATE
Kestrel	2 n=2	15min	Unit	99.72, 98.26	+0.24	—	ADEQUATE
Medutest	1 n=1	25min	Unit	97.50	+0.08	—	ADEQUATE
Nordanalyt	0	35min	High	—	+0.02	—	ADEQUATE

Figure. Tesamorelin 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.