Figure 3From: Variability in detection and quantification of interferon β-1b–induced neutralizing antibodies Inter-laboratory comparison of neutralizing antibody (NAb) status and NAb titers. The number of samples yielding values below the lower limit of quantification (LLOQ) in both laboratories is given in the gray boxes. The solid line indicates equal titer levels in both laboratories. Dashed lines indicate the LLOQs of the respective laboratories.Back to article page