AssayIndex
Cross-section

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

33 recordsmedian 99.46 %spec 98.5 %
LaboratoryReportsGradientMS resolutionMedian purity %Published bias (pp)Bias-adjustedMethod suitability
Janoshik1830minHigh99.47+0.0099.47ADEQUATE
PeptideMeter828minHigh99.66-0.0599.70ADEQUATE
Medutest3 n=325minUnit99.86+0.0899.78ADEQUATE
VendorInvestigate2 n=232minHigh98.35, 98.44-0.11—ADEQUATE
Nordanalyt1 n=135minHigh99.44+0.02—ADEQUATE
Kestrel1 n=115minUnit99.31+0.24—ADEQUATE
98.298.598.899.199.499.7100.1JanoshikJanoshik: Q1 99.16, median 99.47, Q3 99.63, n=18outlier 98.34n=18PeptideMeterPeptideMeter: Q1 99.23, median 99.66, Q3 99.85, n=8n=8MedutestMedutest: Q1 99.31, median 99.86, Q3 99.90, n=3n=3VendorInvestigateVendorInvestigate: Q1 98.37, median 98.39, Q3 98.42, n=2n=2 Purity (% area)
Figure. Desmopressin 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.