Table 2: Early-stage treatment Infliximab level cut-offs with sensitivity, specificity and positive likelihood ratio (LR+) values.

Week Cut-off Sensitivity
(95% CI)
Specificity
(95% CI)
LR+
2 21.2 μg/mL 67% (44-84) 86% (70-95) 4.8
6 4.4 μg/mL 70% (45-88) 95% (83-99) 14
14 0.4 μg/mL 83% (35-99) 89% (75-97) 7.9
22 0.2 μg/mL 100% (15-100) 94% (81-99) 18

CI, confidence interval; LR, Likelihood Ratio.