AssayIndex
Cross-section

Exenatide 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 Exenatide, with a class minimum gradient of 25 min, the method is a live explanation.

36 recordsmedian 98.94 %spec 98.0 %
LaboratoryReportsGradientMS resolutionMedian purity %Published bias (pp)Bias-adjustedMethod suitability
Janoshik1830minHigh99.03+0.0099.03ADEQUATE
PeptideMeter7 n=728minHigh98.89-0.0598.94ADEQUATE
Medutest7 n=725minUnit99.48+0.0899.40ADEQUATE
Kestrel2 n=215minUnit99.26, 99.93+0.24—BELOW CLASS MINIMUM
VendorInvestigate1 n=132minHigh98.64-0.11—ADEQUATE
Nordanalyt1 n=135minHigh98.38+0.02—ADEQUATE
97.798.198.598.999.399.7100.1JanoshikJanoshik: Q1 98.58, median 99.03, Q3 99.37, n=18n=18PeptideMeterPeptideMeter: Q1 98.58, median 98.89, Q3 98.94, n=7outlier 99.73n=7MedutestMedutest: Q1 98.25, median 99.48, Q3 99.59, n=7n=7KestrelKestrel: Q1 99.43, median 99.59, Q3 99.76, n=2n=2 Purity (% area)
Figure. Exenatide 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.