Table.

Response to Assay of Infliximab or Adalimumab Drug Levels and Antibodies in Patients With Continued Inflammation

Drug Present?	Antibodies Present?	Action
No drug	High titer	Switch anti-TNF α agent
No drug	No antibodies or low titer	Dose increase
Inadequate	No antibodies or low titer	Dose increase
Adequate	No antibodies or low titer	Switch classes

TNF, tumor necrosis factor.