Laboratory investigations done for the index child
| Lab parameter | Result | Normal value |
| Complete blood count | Haemoglobin 123 g/L Platelet count 314×109/L White cell count 5.2×109/L Neutrophils 38.8%; lymphocyte 50% Monocyte 7.2% Eosinophils 3.3% Basophils 0.7% | 124–148 g/L 150–400×109/L 4.5–13.5×109/L 24%–74% 29%–49% 2%–10% 0.1%–4% ≤1.9% |
| Erythrocyte sedimentation rate | 21 mm/hour | ≤20 mm/hour |
| Procalcitonin | <0.05 ng/mL | <0.5 ng/mL |
| C reactive protein | <0.5 mg/dL | <0.8 mg/dL |
| Ferritin | 9.6 ng/mL | 11.5–300 ng/mL |
| D-dimer | 850 ng/mL | <230 ng/mL |
| Prothrombin time | 15.1 s | 9.7–12.9 s |
| Activated partial thromboplastin time | 34 s | 25–37 s |
| International normalised ratio | 1.34 | 0.90–1.10 |
| ANA screen | Negative | |
| Troponin I | <0.030 ng/mL | <0.120 ng/mL |
| C3 | 133 mg/dL | 81–163 mg/dL |
| C4 | 23 mg/dL | 14–46 mg/dL |
| IgA | 278 mg/dL | 24–268 mg/dL |
| IgG | 1691 mg/dL | 768–1632 mg/dL |
| IgM | 89 mg/dL | 41–250 mg/dL |
| IgE | 112.6 IU/mL | 1.9–170 IU/mL |
ANA, antinuclear antibody.