Figure 2
From: Variability in detection and quantification of interferon β-1b–induced neutralizing antibodies
Intra-laboratory comparison of NAb status and NAb titers at Laboratory A. The titer value of a sample measured in Laboratory A (II) three years after the end of the study (x-axis) is plotted against the value of a sample measured in Laboratory A (I) shortly after the end of the study (y-axis). A total of 43 samples tested negative in both laboratory runs. The solid line indicates equal titer levels in both laboratories the dashed lines indicate the lower limits of quantification.