EQA results of ANA/AIT test on anti-Jo1 according to participants’ description (n = 72). Products of the following manufacturers were used by participant institutes: Bio-Rad Laboratories, Euroimmun, ImmunoThink, INOVA Diagnostics, MBL, and Zeus Laboratories.
| Described Patterns | n | Described Patterns | n |
|---|---|---|---|
| Cytoplasmic | 27 | Cytoplasmic + speckled | 4 |
| Cytoplasmic fine granular | 2 | Cytoplasmic + nuclear dots | 2 |
| Cytoplasmic (fine speckled) | 1 | Cytoplasmic + fine nuclear dots | 1 |
| Cytoplasmic fine speckled (anti-Jo1) | 1 | Cytoplasmic (granular) + homogeneous | 1 |
| Cytoplasmic coarse granular | 1 | Cytoplasmic discrete + speckled | 1 |
| Cytoplasmic (mitochondrial) | 1 | Speckled | 2 |
| Cytoplasmic (weak-positive) | 1 | Peripheral | 1 |
| Antimitochondrial | 2 | Nuclear membranous | 1 |
| Anti-Jo1 | 1 | Weakly positive | 1 |
| Lysosomal | 2 | Negative | 19 |
EQA: external quality assessment; ANA: antinuclear antibody; AIT: autoimmune target.