Autoimmune screen results from initial patient presentation
| Antibody | Result |
| ANA | >1280 (<160), homogeneous pattern |
| HLA-B27 | Negative |
| Rheumatoid factor | Negative |
| Anti-CCP | Negative |
| Anti-dsDNA | Negative |
| Anti-Smith | Negative |
| Anti-nucleosome | Negative |
| Anti-SS-A/SS-B | Negative |
| Anti-Jo | Negative |
| Anti-U1RNP | Negative |
| Anti-Scl-70 | Positive |
| Anti-RNA-polymerase III | Negative |
| Beta-2 glycoprotein | Negative |
| Anti-cardiolipin | Negative |
| Serum C3 | 1.04 g/L (0.90–1.70) |
| Serum C4 | 0.17 g/L (0.10–0.40) |
| Anti-GBM | Negative |
| Anti-MPO/PR3 | Negative |
| Free light chain kappa/lambda ratio | 1.24 (0.26–1.65) |
| ESR | 17 (<21) |
ANA, anti-nuclear antibody; anti-CCP, anti-cyclic citrullinated peptide; ESR, erythrocyte sedimentation rate.