General characteristics of ANA testing in participating laboratories (N=36)
| Questionnaire | Category | No. of response (%) |
|---|---|---|
| No. of monthly ANA tests | Less than 300 | 2 (5.6) |
| More than 300–less than 600 | 13 (36.1) | |
| More than 600–less than 900 | 6 (16.7) | |
| More than 900 | 15 (41.7) | |
| ANA screening method | Indirect immunofluorescence assay | 36 (100.0) |
| Reagent manufacturer | Bio-Rad (Hercules, CA, USA) | 11 (30.6) |
| Euroimmun (Lubeck, Germany) | 7 (19.4) | |
| Inova Diagnostics (San Diego, CA, USA) | 9 (25.0) | |
| ZEUS Scientific (Branchburg, NJ, USA) | 7 (19.4) | |
| Others | 2 (5.6) |
Abbreviation: ANA, antinuclear antibody.