Table 1.
Results of serological investigations
| ANA | Positive, speckled pattern, 1:2560 dilution |
| Rheumatoid factor | 192 IU/mL (0–0.29 IU/mL) |
| Anti-SS-A | Positive |
| Anti-SS-B | Positive |
| Anti-Smith | Negative |
| Anti-RNP | Negative |
| Anti-Jo | Negative |
| Anti-SCL | Negative |
| C3 (g/L) | 0.97 (0.90–1.80 g/L) |
| C4 (g/L) | 0.09 (0.10–0.40 g/L) |
| Anti-MPO | Negative |
| Anti-PR3 | Negative |
| Anti-GBM | Negative |
| Anti-thyroid peroxidase | Negative |
ANA, anti-nuclear antibody; anti-GBM, anti-glomerular basement membrane antibody; anti-MPO, anti-myeloperoxidase antibody; anti-PR3, anti-proteinase 3 antibody; anti-RNP, anti-ribonucleoprotein; anti-SCL, anti-topoisomerase; anti-SS-A, anti-Sjögren’s syndrome related antigen A; anti-SS-B, anti-Sjögren’s syndrome related antigen B; C3, Complement 3; C4, Complement 4.