AssayIndex
Cross-section

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

48 recordsmedian 99.81 %spec 98.5 %
LaboratoryReportsGradientMS resolutionMedian purity %Published bias (pp)Bias-adjustedMethod suitability
Janoshik2230minHigh99.93+0.0099.93ADEQUATE
Medutest1025minUnit99.69+0.0899.61ADEQUATE
VendorInvestigate932minHigh99.63-0.1199.74ADEQUATE
PeptideMeter4 n=428minHigh99.69-0.0599.74ADEQUATE
Nordanalyt2 n=235minHigh99.92, 99.93+0.02—ADEQUATE
Kestrel1 n=115minUnit99.44+0.24—ADEQUATE
98.999.199.399.599.699.8100.0JanoshikJanoshik: Q1 99.69, median 99.93, Q3 99.93, n=22outlier 99.10outlier 99.11outlier 99.23n=22PeptideMeterPeptideMeter: Q1 99.51, median 99.69, Q3 99.75, n=4outlier 98.98n=4MedutestMedutest: Q1 99.60, median 99.69, Q3 99.84, n=10outlier 99.09n=10VendorInvestigateVendorInvestigate: Q1 99.28, median 99.63, Q3 99.81, n=9n=9NordanalytNordanalyt: Q1 99.92, median 99.93, Q3 99.93, n=2n=2 Purity (% area)
Figure. Oxytocin 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.