Table 2
Test characteristics of serum IgG4 concentration elevation
Characteristic (%)
IgG4 >135 mg/dL
IgG4 >270 mg/dL
IgG4:total IgG (Cut-off >0.08)
Sensitivity
90
35
86
Specificity
60
91
59
Positive predictive value
34
48
33
Negative predictive value
96
86
95