Specific instruments previously selected by the ASAS Working Group18 and corresponding to the domains selected during the second turn of the Delphi technique
| Domain | Instrument |
|---|---|
| Patient’s global assessment | VAS, past week |
| Inflammatory pain | VAS, past week, due to AS |
| Functional impairment | BASFI |
| Refractory to NSAIDs | – |
| Laboratory parameters | ESR or CRP |
| Number of swollen joints | 44 |
| Number of tender joints | 44 |
| Tender enthesis | – |
| Refractory to local treatment | – |