AssayIndex
Cross-section

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

15 recordsmedian 99.20 %spec 98.0 %
LaboratoryReportsGradientMS resolutionMedian purity %Published bias (pp)Bias-adjustedMethod suitability
Janoshik7 n=730minHigh99.23+0.0099.23ADEQUATE
Medutest4 n=425minUnit98.78+0.0898.70ADEQUATE
PeptideMeter2 n=228minHigh99.38, 98.87-0.05—ADEQUATE
VendorInvestigate2 n=232minHigh99.09, 99.59-0.11—ADEQUATE
Nordanalyt035minHigh—+0.02—ADEQUATE
Kestrel015minUnit—+0.24—BELOW CLASS MINIMUM
98.398.598.899.099.299.599.7JanoshikJanoshik: Q1 99.10, median 99.23, Q3 99.28, n=7outlier 98.53outlier 99.60n=7PeptideMeterPeptideMeter: Q1 99.00, median 99.13, Q3 99.25, n=2n=2MedutestMedutest: Q1 98.61, median 98.78, Q3 98.96, n=4n=4VendorInvestigateVendorInvestigate: Q1 99.22, median 99.34, Q3 99.47, n=2n=2 Purity (% area)
Figure. Glucagon 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.