Results of investigations
| Investigation | Result |
|---|---|
| Full blood count | Normal |
| Erythrocyte sedimentation rate | Normal |
| Autoantibodies—antinuclear antibody, antimitochondrial | Negative |
| Rheumatoid factor | Negative |
| Viral titres, including mycoplasma, borrelia | Normal |
| Porphyria | Normal |
| Heavy metals—lead, arsenic, thallium, mercury | Normal |
| Blood lactate | 4.8 (0.9–1.8) |
| Immunoglobulins | Normal |
| Oligoclonal bands | Negative |
| Very long chain fatty acids | Normal |
| Vitamin B12 | Normal |
| Folate | Normal |
| Cerebrospinal fluid glucose | 4.1 (2.8–4.4) |
| Protein | <0.1 (0.1–0.4) |
| Lactate | 2 (0.9–1.8) |
| Nerve biopsy | Axonal degeneration |
| Magnetic resonance imaging, brain | Normal |