Investigations summary
| Day 1 | Day 7 | |
| Biochemistry | ||
| Urea and electrolytes | Normal | Normal |
| C-reactive protein, mg/L | 207 | 339 |
| Alanine transaminase, U/L | 38 | 15 |
| Alkaline phosphatase, U/L | 76 | 245 |
| Albumin, g/L | 36 | 17 |
| Albumin adjusted calcium, mmol/L | 2.19 | 2.07 |
| Creatine kinase, U/L | 42 | 390 |
| Lactate dehydrogenase, U/L | - | 351 |
| Procalcitonin, ng/mL | - | 38.7 |
| Ferritin, μg/L | - | 12,423 |
| Triglycerides, mmol/L | - | 1.8 |
| Haematology | ||
| Haemoglobin, g/L | 140 | 115 |
| White cell count, × 109/L | 12.8 | 28.7 |
| Platelets, × 109/L | 210 | 243 |
| Prothrombin time, seconds | 12 | 16 |
| Activated partial thromboplastin time, seconds | 25 | 31 |
| Fibrinogen, g/L | - | 5.5 |
| Erythrocyte sedimentation rate, mm/hour | - | 7 |
| Immunology | ||
| Immunoglobulins | Normal | |
| Antinuclear antibody, extractable nuclear antigen antibody, antineutrophil cytoplasmic antibody and liver autoantibody screen | Negative | |
| Microbiology | ||
| Blood cultures (nine sets) | All negative | |
| Urine cultures | Negative | |
| Respiratory viral screen (influenza A & B, respiratory syncytial virus, parainfluenza, enterovirus, rhinovirus, metapneumovirus, adenovirus and seasonal coronavirus) | Negative | |
| Urinary antigens (Legionella and Streptococcus pneumoniae) | Negative | |
| Mycoplasma pneumoniae | Negative | |
| HIV serology | Negative | |
| Epstein–Barr virus serology | Negative | |
| Cytomegalovirus serology | Negative | |