| Investigation | Result |
| Chlamydia PCR (nasal secretions) | Negative |
| Chlamydia PCR (eye swabs) | Negative |
| Chlamydia serology | Negative |
| CMV IgM | Not detected |
| CMV PCR (serum) | Negative |
| CMV PCR (urine) | Negative |
| EBV IgM | Not detected |
| Parvovirus IgM | Not detected |
| Parvovirus serology | Negative |
| Toxoplasma IgG | Not detected |
| Respiratory viruses panel | Negative |
| NPA | Negative |
| Lymphocyte subsets | Normal |
| Antineutrophil antibodies | Not detected |
| x ray left wrist | Normal |
| Chromosome fragility for Fanconi’s anaemia | Normal |