A 55-year-old with a background of myelofibrosis is brought to the emergency department by ambulance. She was found by her son with a right-sided weakness and dysphasia. She looks pale and is febrile. Her son tells you she has been unwell for a few days. Her CT brain shows an area of potential acute infarct. Her FBC is below.
| Haemoglobin (g/L) | 50 (115-165) |
| Mean Cell Volume (fl) | 115 (80-100) |
| Platelets (109/L) | 120 (150-400) |
| White cell count (109/L) | 176 (4-11) |
| Neutrophils (109/L) | 80 (2.0-7.5) |
| Eosinophils (109/L) | 3.0 (0-0.4) |
| Basophils (109/L) | 1.0 (0-0.1) |
| Monocytes (109/L) | 92 (0.2-0.8) |
| Lymphocytes (109/L) | 3.2 (1.5-4.5) |