Figure 1

IgG4 serum levels of patients confirmed with and without IgG4-related disease measured using either BSIN or LC–MS/MS. The median and IQR of the IgG4 levels are shown in the boxplots. IgG4-RD = IgG4-related Disease BSIN = Binding Site immunonephelometry; LC–MS/MS = liquid chromatography-mass spectrometry/mass spectrometry.